As some you may know I've had a custom dual exhaust on my car for some time. I've noticed a lot of interest in aftermarket cat back exhausts lately and would like to offer my services.

How much interest is there for a dual exhaust that bolts up to the first se t of cats and eliminates the second? What material are we looking for? Muffler sound? Tip design? Price? Performance gains?

If there is a decent amount of interest I will look into reproducing what I have for mass sale.

The other thing I would like to get into is constructing an intake. I've been playing around with some designs and have a couple that may work.

Is there an interest in an intake? Dual or single? Material? Price?
Again, if there is enough interest I may be producing some.

For the Intake I will test the new design compared to stock at both the strip and on the dyno.

The Exhaust is already on my car, so the best I can do is do a dyno run and compare to someone else's stock plot.

Please let me know all questions and concerns.

Thank you.

 

I'm interested in a cat forward (off-road) exhaust, or something to that effect.

No need to do a dyno comparo if your going to run on a 1/4 mile track. The track is more accurate in giving hp numbers.

 

I'd be interested too. do you have a sound clip of your exhaust? Also, I'm with Maxwell about the "off-road" exhaust. I don't have emissions testing.

For sound, I'd like something that isn't too extremely loud, but something that will give people the O-face when I get on it. You know what I mean! I like the stock tips, so I would definitely keep that. Is your system true dual from the headers or does it come together and then split?

For the intakes, I would also be interested in a dual system.

Prices? Obviously as low as possible. I was going to check with an exhaust shop around my area to see what we'd be looking at. I'm thinking about $300 - $400 would be a good price for the exhaust. For the intakes, depending on filters and materials, I'd say probably $150. But that's just me.

 

My exhaust is SS dual from the headers back and goes into a dual in dual out muffler. It has different tips then stock. Pics are in my gallery.

When I got my exhaust the price was $1,200 for R&D and assembly. I'm hoping with the R&D done already that reproductions can be had for around $500 - $600. 400 seems unreasonable unless the volume is extreme. I don't even think that the cat backs we have now are that cheap.

As far as the intake, dual filters alone will cost about $80 - $100 depending on quality. The piping, ducting, clamps, etc. will also add up and bring the cost closer to $200+.

Like I said, if there is enough interest we an get this thing going. If at least ten people are interested in both, I'll start pricing and go from there.

 

Definitely interested in a ready-to-assemble CAI kit... I just don't have enough time for any more DIY projects unfortunately...

 

I know there is an interest in the CAI. My question is what price and materials are we looking for. I'm sure I can fabricate a single intake system for $150 or less, but is this what everyone wants? The more details I get, the better the finished product.

 

After doing some preliminary research I found out some piping sizes.

I tried using 3" intake tubes and filters and found that the car runs way rich and noticed almost no performance difference. If anything I think there might have been a loss in performance.

The ideal intake size should be around 2.38", so I'm going with 2.5" dual piping. If we were to go single 3" would be best. This size should be sufficient for 250+ hp, which I don't see too near in the future.

As far as the exhaust dual 2.5" also seems to be the best. Going higher then that will cause a loss in back pressure and a decrease in low end torque.

The next two restrictions are the throttle body and the cats, but I'm not sure what the stock size is for that. I'll look into it.

 

For me to be interested in an exhaust here would be my suggestion:

Make the setup so that it takes out the rear cat converters but can be easily bolted and band clamped up, don't use stainless steel and just go aluminized as that will DRASTICALLY reduce your pricing, and then do whatever from there on back. Maybe even consider new downpipes with high flow primary cats.

Also, i'm not sure if true dual 2.5" is absolutely necessary as this car is not a big cube v8. If you were going to stay true dual i would say go with 2.25" for better velocity while still maintaining back pressure. Granted the best money saver would be to bring it into one pipe all the way out the back like all other systems.

Do you have any sound clips of your exhaust?

And personally i would like to maintain the stock tips if there was a way to do it.

My biggest beef with all aftermarket exhaust is them preaching about stainless steel. I live in FL and need SS like a hole in the head. And even when i lived in NJ most aluminized exhausts would last the life of the car! I just can't justify the costs. If only i had a mig welder. :-(

 

Yes as far as a dual exhaust goes 2.25" or even 2" would be adequate. The stock tips can be used and the easy bolt on ability will be included.

I made a run today with just the exhaust and everything else stock.

The results were 14.400@94.649. I'm pretty excited about this, more for the trap speed improvement which has never been over the 93 mark.

I think with a little improvement in the intake and traction I can see a 14.1 or hopefully a 13.9.

 

Impressive times my friend. What was the temp/humidity/elevation? Conditions?

94 mph is definitely good for at least another tenth or two off your quarter if you can get a good launch.

The intake is going to be a real battle for sure as the setup on the car is just ridiculous as far as good flow goes. The engine bay is cramped and if you make the piping longer into a fender well lets say then the it will be too long and not net you any hp. But then you try to keep it short and all you are doing is breathing in hot air from the engine. As a hint for intake design make the intake end as large as possible and funnel it down into the TB. The lxforums.com guys have one out that kinda looks like that and on the dyno it is making serious gains but at a serious price as well. Here is a link to the setup: http://cgi.ebay.com/ebaymotors/ws/eB...m=180057794542 but granted the big gains were only made with a HUGE filter and not the small one shown in pics.

Oh and do you have the ability to come up with any sound clips of your exhaust?

 

That's a very interesting item there and makes a lot of sense. I've played around with cone filters at the end of the airbox and actually lost power due to the hot air. It seems a modified stock setup is best. Actually a single intake to the driver's side I found can get cold air through the fog light area, but it only works on that side.

I would produce something like that, but it seems this crowd is in it for the looks of a dual.

As far as the sound clips go, I can record video, but don't really know how to host it.

The conditions were 200 ft elevation, 72 degrees, and 0 relative humidity.

My previous best was with a half tank of gas at 42 degrees with the cone filters and V8 box that netted me the 93.6.

This time I had a full tank of gas.

I concentrate mostly on trap speed because ET is too dependent on driver, track condition, and car set-up. I've had 15.6 runs at 92.XX in the very beginning.

 

Well i guess you are getting your sixty foot times figured out for sure. You must have cut like a 2.1 or so im guessing. Conditions were good too but an obvious increase in power since the temp went up and you still went faster.

In my opinion on the intake i think that if you make something that is more functional than looks then you will have a best seller. A lot of people here like looks but there are already intakes out there for looks and if they knew there was a proven power gain from something then they would be more apt to buy it i think. Even if it was only 5 hp or 7 hp that is better than anything else we have right now.

So when do you think you could make that exhaust up? I know i would be interested in it even just the way it is if you could do it aluminized to save some money on cost.

 

I have been following this thread for a bit and agree on the single intake idea. I don't see how you couldn't improve over stock. The air box is right over the motor heating the air and there is close to none as far as room for the air to travel. Ideally I would say a single 3 inch pipe from throttle body down the side of the motor to a single cone filter and get rid of the whole airbox all together (if you don't mind seeing the motor).

 

I'll chime in and say I'd definitely be interested in both...

Overall I'd like some gain in performance through both upgrades...not expecting leaps and bounds...

I'd like to keep the stock exhaust tips and keep a smooth but powerful sound...

Intake I'd be open to dual but the single is appealing in its simplicity...

Anything that will improve upon the 215 hp would be exciting for me at this point...

 

Precisely. As sweet as a dual intake looks, I'm not going to buy something that is either A. going to reduce my horsepower or B. won't give me any gains. Same goes for exhaust. I want dual tips of course, but a single pipe is fine if that turns out to be the ideal power-making set-up. There are people out there that have a lot better of an idea of what an ideal set-up is than I do.

 

Check out my dual exhaust pics in my gallery. I have track results that show about a 2 mph gain in ET over stock setups. I've never had it dynoed though.

As far as the dual cone setup, I lost about .6 mph in the quarter opposed to stock. I'll try to fab up a single intake if the demand is there.

Would anyone be interested in a replica of my system?

 

do you think there would be a pretty good hp gain over stock with single intake?

 

I would imagine a decent gain, but you gotta remember a 5 hp gain on a 215 hp engine is a huge deal compared to 5 hp on a 330 hp engine.

I'd expect 10-15 hp peak at best. That's probably a little optimistic, but if there's interest I'll fab something up and dyno it.

 

i would be interested... right now the best I have been able to come up with is two cones and hacking the crap out of the stock ducts to let more air to the filters...

 

I envy you man. I get to drag race at about 6,000 ft. and it kills on times, i am almost a second slower than what the book tells me I should run due to simply elevation. When I get the chance I will post some numbers and maybe somebody can loan me a box of tissues. lol Let me know what you come up with for intakes.