Hi all,

Last February I had the Megan Racing M-RS muffler installed on my 2005 Base Coupe (6 speed). I love the sound, but I'm wondering if there would be a benefit of switching to the Magnaflow Catback for our cars.

I'm sure the sound is similar, but are there horsepower gains to be had with the Magnaflow?

My problem is, when I had the muffler installed, the guy that did it cut the OEM muffler off, and had to bend a new piece of pipe/weld the new muffler on. So maybe that is creating unnecessary back pressure, or something?

I notice when I downshift into 2nd at lower RPM's/speeds, there is a loud popping sound that comes from my exhaust. It really started doing it after I added my Needswings DCAI. Would the Magnaflow exhaust increase my car's ability to "breathe"? (And eliminate/lessen the "popping" issue?)

Mainly, I just want to know if, in conjunction with my Needswings DCAI (and soon-to-be-had Eurocharged tune), the Magnaflow Catback exhaust would add a noticeable amount of horsepower.

Any insight would be greatly appreciated. Thanks!

Regards,
Eric

 

Save your $$$. I actually prefer the note of the Megan over the Magnaflow.

Secondly, the muffler only gains you a TINY amount of horsepower. As long as you still have stock headers, all four cats, and factory piping, the biggest change you get is in your ears.

I have an Ansa muffler, and trapped a higher trap speed than another Limited owner that has a Magnaflow catback. The Ansa sounds great but a quick peek at the inside lets you know it's no race muffler.

With the NW DCAI, Eurocharged tune, and the Megan muffler, you should be in the mid/low 14's with a decent launch.

I ran two weeks ago with a EC tune, C320 intake and Ansa muffler and clocked a time of 14.8 @ 96.7... but my 60' times were horrid at 2.3

The Limited 6-speed NEEDS a bit of wheel spin, otherwise it simply bogs. There was so much VHT on the track that I couldn't even do a proper burnout. Every "launch" was a 3,500 RPM clutch drop and it bogged down to 1,500rpm on the takeoff.

Instead of spending $400 on a catback that *might* gain 2hp, save your pennies and jump in on the header group-buy. Then you'll get some real ponies.

 

Right on, thanks for the info.

The headers are a little too pricey for me to afford. I'll be getting my Eurocharged tune under their end of the year sale they have going on right now, in December.

And... granted it's illegal. What's your opinion of running muffler-less? Would that add any HP?

Thanks,
Eric

 

Muffler-less would kill torque... Sounds good though! Not recommended for a daily haha

 

Yeah everyone keeps telling me it's stupid and i'll just get pulled over.

But then again..that's probably true

With my XF as my daily.. I probably should just leave it alone. lol