That lost torque could easily be regained with the Needswings manis...

And I agree with what you're saying, any launch above 1,000 RPM is an instant burnout, but we lose a bit of steam up top compared to similar time-slips with other cars... For instance, I only hit ~112 in the 1/4 mile with a 12.3 ET...

 

Our cars have enough to loose a little and not notice it much. For comparison, I have a 2005 300C I put on the dyno and the SRT-6 has more HP and torque so for me the argument about loosing a little doesn't worry me at all. I'm like Grip in a way, I want to see the dyno comp headers on a SRT-6 (non fanboy) with graphs, personal testimonials and 1/4 mile improvement numbers.

Les

 

there are no synopsis numbers to support their claim. I know I asked the owner

 

Dyno not synopsis

 

There are no before and after dyno sheets. I know because I asked the owner. The claimed HP gains are they quoted are based off the same header design for either the 55 or 63, I don't remember which making an additional 45-55 hp

 

Do they have them installed on a single vehicle? Seems easy enough to have that vehicle hit a dyno and put some meat on the bones of the $3,000 30-horse claim... Even if it's modded, we know these cars well enough to see where the gains take place.

 

I asked if they had ever had the headers on a srt6 and he replied that they have. That is when he explained that the heat shield had to be removed and that the engine needed lifting but that they did fit. He seemed knowledgeable about the installation and the car but who knows.

 

The engine is lifted to gain access to the manifold nuts(bottom row). I can imagine the under-hood temp rising drammatically with the long tubes. With the shields gone, this will probably reduce the life span of anything rubber or plastic under there!

 

With the pre-cats gone the underhood temps should reduce actually. Cats absorb and emit a tremendous amount of heat.

Those headers look amazing. I don't doubt the claimed HP gains. With factory headers our cars are trying to breathe through two 1.75" outlets. 1.75"!! The Dyno-comp headers are probably as close to equal length long tubes as we're going to get. They are certainly better than the OEM modified-log headers.

With correctly sized primary tubes, low-end torque will not be sacrificed. I'm running equal-length LONG tube headers with 1.75" primaries and 3" collectors into a 2.5" exhaust on my Corvette and it has tremendous low-end torque, right off idle. Given the length available for the Crossfire/SLK headers, I'd guess 1.625" primaries would be about perfect. 1.75" might yield a little more HP, 1.5" a little more torque.

That is a LOT of $$ for headers though. Such is the price of exclusivity I guess...

 

First off HOT DAMN!!! Those are some sweet looking tubes there.

Now to quiet the critics...

Ummm are you blind? Those welds are perfect.



Properly built headers will not only increase top end horsepower but will increase torque in heaps as well so stop with the notion that headers will lower torque.

Question is are these properly built?

 

I have ran headers on my Camaros, and even had a set on 1 of my vettes. They will increase hp and torque when properly done. The problem I had with the vette was the compact install caused a lot of heat related problems. Plug wires, other wiring and tubing. You have to insulate for those, as well as the heat under the hood. XF's have even less room in there than the vette's I have owned. I can see why they would have to lift the engine for install, but what are the clearances with the motor set back down? You would have to show me at least the 30hp and better price to even fool with headers again. XF aren't old muscle cars with lots of room for headers and the problems that go with them...

 

Agreed.
Won't be on my "to do" list.

 

I should have added, if you are building a track car, and want to cut some some room in there, that would be fine...but I like a nice looking build...so I would have to pass at that price knowing all the welding and insulating I would also have to do to finish the install. This isn't a cheap project by no means once you have those pretty headers in hand.

 

results! i want results! haha , do we lose or gain torque with this!? price is steep but it getsus soo much closer to that coveted 100hp total gains!

 

Subscribed to this to see any results if any.......if the co wants to sell these to us they need to get on here and back up the claims just like our other vendors do. The price is really outrageous as well so they need to make the R&D back over a broader amount of sells and not 1 set!

 

I don't claim to be some kind of engineer with expertise in this area, but I have done a LOT of reading and researching on many car forums over the years, as well as buying a very expensive and well made set of long tube headers for a previous car of mine -- so I wouldn't say I'm clueless either.

IMO, it's not even as simple as saying the headers will give you an HP and torque gain "when properly done", because I think much depends on the displacement of the engine in question too.

Time and time again, I've seen people try to put long tube headers on cars with 6 cylinder engines and fail to get good results. Meanwhile, it's almost always the guys with the larger V8's who have good things to say about them.

Especially on a lot of the foreign sports cars out there like the Hyundai Genesis Coupe or some of the Nissans, long tube headers wind up generating a lot of "rasp" under acceleration too. It's just not a generally desirable exhaust note at all.

I'd love to see the dyno before and after results for these headers for the Crossfire, and I'm far from being the guy who would definitively tell you they "won't deliver results". But count me skeptical, based on past results I've observed.

These are a labor intensive and expensive modification to make for relatively little gain, too -- even if they're a success. I doubt I'd ever put long tubes on another vehicle of my own.

 

Most expensive headers I could find at Summit Racing: $886.95

Search Results for v10 headers - SummitRacing.com

Good Luck

 

well im excited for the dyno results, if they pan out , thats an absurd power gain from a relatively bolt on mod