purpose of flexi-pipe

**HRV-80Y** · 23-08-2005 01:31 PM

simple question wats the purpose of the flexi-pipe between headers n cat...

n is it necesarry sum1 once told me it is in fwd carz if so reason ?

**chaos coupe** · 23-08-2005 01:36 PM

all i know is to let the cat move a bit freely side to side and it's good to have one.

**VTi_b0i** · 23-08-2005 01:41 PM

correct me if i am wrong, but its to stop the whole exhaust system from moving, the headers are attached to the engine, which moves, esp when revved. so the flexi-pipe prevents the whole exhaust from moving which would happen if it was all solid.

**chaos coupe** · 23-08-2005 01:48 PM

well when i said move i didn't mean in a big movement. Say if u got the flexi pipe it will put less strain on the header. don't quote me on this

**Scandrew** · 23-08-2005 01:52 PM

So the exhaust system has separate movement compared to the engine. Without the flex-pipe, under stress there would be no 'give' in the exhaust system to flex seperately from the engine so the exhaust would be more prone to cracking, especially at the dump pipe/manifold/headers.

**VTi_b0i** · 23-08-2005 01:58 PM

we are all basically saying the same thing lol...

**bennyBear** · 23-08-2005 08:51 PM

Flexi pipe is very important in east-west configuration engines, because of the torque-twist in the engine, this can: Snap bolts and crack pipes!

If your only installing a cat-back system they are not necessary as the honda cat is setup with spring loaded bolts to compensate for the twisting!!

**SKREMN** · 24-08-2005 06:30 PM

Befor i got my flexy pipe i broke the mounts off my exhaust and snaped one m,andrel bend
then i got a flexy and then that flexy even broke coz of too much launching and stuff finally i got a heavy duty dubble braded flexy and no probs to date