can anyone tell me what purpose do test pipes serve?

 

flow for FI applications and louder exhaust note for non-fI

 

and to pollute mother earth 100 times the normal rate.

 

They're used for maximum exhaust flow and power gain. Most test pipes are simply straight pipes and increase exhaust noise significantly, some, however, are fully resonated to reduce sound levels. From a practical standpoint, they're about as useful as 5 inch high-heels (unless you live on the track).

 

but 5 inch high heels look great from my point of view

 

And unless you're boosted. If you're boosted, they're about as useful as a pair of basketball shoes for someone who, well plays basketball.

 

Well, since you put it that way.........

 

^^^^YEAH!!!!!
Very Nice

 

If you N/a then high flow cats is what you want... some gain without the paint in the *** or a cell, and it may be a bit stinky


If Boosted test pipes are good for high boost aps and help getting the exhaust out faster...

 

horrible english man, and uhh u should read up on cars

 

so if you have to take out the emmissions box to put on test pipes doesnt that make them illegal if thats what you have to do

 

This is why some responsible folks who use the test pipes and boosters drive them on the track. Technically, you're not supposed to remove the catalytic converter, but most folks do with their test pipes. A minority of people interchange them-- install them when on the track and remove them when on the road since they're essentially a bolt on part. Joedaddy1 is right though, test pipes do leave a huge carbon footprint; however, if you read the posts of >90% of those on this forum, this is of minimal concern--- it's all about the bling factor!!!

 

what a HFC for then?