Hello, my apologies for asking but there are so many threads it is hard to find the consensus.

What exhaust will offer the most HP gain for a 2008 G37 coupe? I see lots of options, Invidia, HKS, Greddy, Stillen

I don't care about sound or looks, I care about performance.

 

By exhaust I'm guessing you mean a catback exhaust system in which any single exit would be a good setup.

 

Yes catback, are any better than others? Such as Stillen vs. HKS

 

You'll want to go with a single exit for the best performance / weight AFAIK. I think there is a Greddy one, Tomei, SOHO..

 

Thank you. Ok, I guess I don't want single exit exhaust, so looks do matter.

Out of the popular brands is there much difference in performance? HKS, Stillen? I was thinking of getting Stillen because it is so popular.

 

I've been on this forum for 10 years, and while opinions vary, Stillen is certainly not popular. However, you mention Stillen in all three of your comments. so it seems you already know what you want. ARK, Motordyne, Fast Intentions, GT-Haus... those are brands considered top-shelf around here.

As for performance considerations... meh. If one setup dynos 1hp better than the others (and it won't be Stillen), does it really matter?

 

I don't know how far you plan to mod your car, but generally a 2.5" exhaust will have less torque down below and midrange, but it will have maybe 5-10 more peak HP. It just depends where you want your power to be. Most people stick with 2.25" for N/A. This is based on my experience here and speaking directly with Fast Intentions about it.

 

Totally Disagree

 

That's very informative. I guess you know better than FI right?

Of course every setup is going to be slightly different, but overall my statement proves true.

 

Oh, so that's why FI makes exhaust made from 2.5 tubing... They want to make less HP.
Had 2.3 exhaust and a currently 2.5.
2.5 makes more torque and hp across the power band.

I am sure your statement is true

 

From FI website:

• 2.25" mandrel bent T-304 stainless steel tubing keeps interior noise resonance to a minimum.
• Optional 2.5" mandrel bent T-304 stainless steel tubing available. (Recommended for cars with forced induction)

 

FROM FI WEBSITE:This cat back exhaust system is the premier upgrade for all G37 coupe owners looking to maximize the performance from their VQ37VHR V6 engine. Our exhaust system will enhance the sound that Infiniti created from the factory by making it deeper, smoother, and louder.

Built as a direct OEM replacement, our exhaust system is easy to install with simple hand tools; no cutting or welding required. All of our exhaust components are T-304 stainless steel with 2.5" tubing that is mandrel bent to maximize exhaust flow and efficiency. The X Pipe is designed to increase low end torque and maximize power throughout the entire RPM band. This exhaust system is unobtrusive at idle and cruising speeds; but comes to life at wide open throttle. The addition of this exhaust system will improve the aesthetics of your vehicle with its sporty and classy appearance. In terms of overall sound, this cat back is our quietest option available.

 

A forum cat fight consisting entirely of quotes from FI's website. LOL

 

LOL, I guess the coupe is 2.5 inch minimum huh? I was looking at the sedan so that's my bad.

Go 2.5 inch then and give it hell!!

 

I just realized, all this time, I was losing torque down low...
All that work in pursuit of more torque... Motordyne manifold, 3.5" intake, TB's spacers... All that work for nothing.