as it states, how can i check without having to go to a workshop? i dun have my own ramp where i can get under the car..

95 Jap TT

Measure the circumference of the downpipe and divide that number by 3.14 [pi]? That should give you the outer diameter. I can't help you on finding the inner diameter unless you unhook the downpipe from the cat.

"There is a difference between a SPORTY car and a SPORTS car."
"Putting a Supra spoiler on your Civic does NOT make it a Supra"

HKS 75mm Cat-back
K&n FIPK
HKS EVC iV
Pending BHG
To undergo 1JZ-GTE conversion

haha i actually meant to ask how to get to the downpipe since i dont have a ramp to jack up the car and measure the pipe.. possibly the boost pressure it usually runs before/after the downpipe i dunno..

95 Jap TT

Not even your stickers can save you from me kickin' your rice a$$.

yup, thats what im saying. and take a good guess. Or the other safe ways is to go have your oil changed and beg the mechanic to let you in to look under your car or have him measure it for you..