Smallest exhaust size under 300hp
 

Hey peoples,I did a search but couldnt find anything.I was just wondering if i could keep my greddy piping on my dohc vtec soon to be boosted or if i need to get something bigger for the turbo application.The greddy piping is rather large but to be on the safe side id say its 2 1/4. My friends tell me to to swap it out in favor of str8 3inch piping, but im on a budget here.Would the 2 1/4 be ok?If any how much performance would i lose?

Re:Smallest exhaust size under 300hp
 

I would go at least 2.5" if you are planning on going over 200 whp.

Re:Smallest exhaust size under 300hp
 

If your on a budget youll be ok.It will give you a little lag(traction controll ;)).I kept my 2.25" manderal bent piping and it lagged a little.But once it built boost it was ok.

Re:Smallest exhaust size under 300hp
 

i had 2 1/4 stock exhaust and had a 2 1/2" mandrel bent exhaust installed. i have a straight through fart can style muffler and no catalytic. my car was boosted before and after the 2 1/2" exh. there was a slight difference with the 2 1/2"exh. the turbo spools up to full boost 10psi in 2nd gear 300rpms sooner. but if you have to run the 2 1/4" exh like i did for a couple of months, then there's nothing wrong running it like that, you will feel a difference with the bigger exhaust but it will be minimal. and 2 1/2"exh is good til 500whp. i'm not making this up it's in this link, under exhaust:
http://www.beesandgoats.com/boostfaq...o.html#Exhaust

Re:Smallest exhaust size under 300hp
 

answered your own question, if you're on a budget stick to what you got. ;)

Re:Smallest exhaust size under 300hp
 

if you're on a budget, leave the stock exhaust on and get an e cut out, it's only 150 bucks and it will give you the most power when you need it, and you can be sleeper at all other times ;)

Re:Smallest exhaust size under 300hp
 

Why do most people say you should usually get 3" when 2.5" is good up to 400-500whp? What are the reasons for people choosing 3" other than if they plan to make over 400-500whp?

Re:Smallest exhaust size under 300hp
 

Yea I told them all 3" was a bit on the huge side.I guess Ill ride out with what i got until i have some xtra cash to spend!Thanks every1.

Re:Smallest exhaust size under 300hp
 

just go with 3" if you can in the future... alot of people might say its too big but im calling bullshit....

i had a true ID 3" thermal r&d exhuast on my all motor b16 with bolt ons.... stock internals....

even with a shity small intake, and a shitty greddy header i was still pulling 94-95mph traps in my eg....

top end ripped hard for a b16....

Re:Smallest exhaust size under 300hp
 

I felt the difference between 2.5" and 3" immediately..depends on how much boost your running I guess..and the type of turbo...