Exhaust HP Gains
 

After seeing all the different vids on what the various exhausts sound like I'd like to see some HP numbers after the mods. Anybody seen any numbers yet??

Nobody is going to post those yet, not until their products are finalized. Even then the numbers will be scrutinized to death and in the end we wont know which we can believe.

Personally I'll be waiting for independent testing results.

Fujitsubo has some power and torque figures:

http://www.fujitsubo.co.jp/prods/det...04740/00001473

Plus a bazillion.

yeah you can never trust the companies themselves.... and also what conditions the tests were done. I just cant wait until some board members starts getting fitted with custom exhausts like scooby! Anything really lol. :D

not nearly as much as you would hope. most small n/a motors are pointless to do bolton mods for power (there are a few exceptions i will admit, but not many). either gotta go big or just play around.

Sad but true

Cat back exhaust will do nearly nothing for power. They're purely for sound/looks and maybe weight if designed properly.

Headers will be where any exhaust gains are found.

what he said~! Just go straight pipes to save weight :) unless your ears are sensitive :party0030:

Don't say that too loud, or the K20 guys are going to come over here and start getting cranky....

Everyone should spend a little time on the K20 forums and see what these guys are getting. These guys make 70 Wheel HP over stock like its going out of style. Key to all these mods is going to be tuning.

Right now the only header kit I've seen is the HKS, and no results are available yet.

:word: The K20 responds great to even just bolt ons. Now I dont expect this car to be as responsive, but we cant just assume it will get nothing

I think the gains will be somewhere between the K20 and F20/F22.

And you're right, tuning is going to be a huge factor.

The K20's head ports are HUGE right out of the box, and they flow really well. That why they can make so much power. I REALLY want someone to flowbench the FA20 heads.