Hey I got a 2.5" exhaust from cat back off of his integra. I was wondering if i put this on my civic if it will increase airflow or will it hurt because it doesnt have enough back pressure.

 

i think it's only gonna hurt you. you should just stick with a 2.25, i have a 2.5 straight pipe for my h22

 

Probably going to hurt your gas mileage, unless you have an allmotor d16z6. You will see minimal gains in the 6500 RPM+ range with an exhaust that big, which is useless on your engine

 

2.5 is fine. i had it on my car and it ran fine. it plus it was already there for me for when i went boost. its user prefrence. i would go with the 2.5, cause in the futer if you start building the motor then you dont want to have to change out your whole exhuast .

 

I figured it wouldnt be a good idea it was just free so i thought i would check to see thanks for the replies

 

is it mandrel or crush bent? i think that plays a big part.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xd69 &raquo;</TD></TR><TR><TD CLASS="quote">i think it's only gonna hurt you. you should just stick with a 2.25, i have a 2.5 straight pipe for my h22</TD></TR></TABLE>

 

the bigger is not the better like everyone and their mom thinks - backpressure lost is also torque lost