alright i have a hks hi power exhaust and this morning we installed a Megan Racing 3" dp and Ultimate Racing 3" test pipe, very easy install, just take out the old and put in the new. the results:
OMG, this car pulls like none other! i had not idea i was gonna get this much of a difference. spool up is better, im at 7000 in no time! and on top of that, it sounds bad ***! over all performance, i give it a 10!

 

Nice! I wish I felt a difference when I installed mine, but it felt no different. I can't feel 10-15hp in my butt dyno unfortunately. I haven't felt like you do except for when I put the car in race mode at the track. Enjoy!

 

sweet

 

Good job!

I was impressed when I installed my exhaust as well!

 

i hope u did some tuning along with that upgrade.

 

I installed a cat-back system and really did not feel any power difference. After a flash though it was a different story......

 

Why? None is needed with an exhaust change like that.

 

no tune is needed with a turbo back and cat delete??. and do we see a gain??

 

i am getting ready to install br turbo back and 02 housing i am hoping to notice a differance

 

noticed a big diff after I installed my helix test pipe and cat-back

 

Yes.

 

As stated on Dynoflash.com

 

heh i donno im pretty sure ur gettin some fuel cut or something without a tune....

 

Terribly wrong.

 

Interesting.......well, fuel cut comes when the ECU senses too much air entering the engine. Has nothing to do with the exhaust. It usually occurs from running more boost than the ECU will tolerate.