I am looking into doing my own exhaust setup, and I was planning on using flex pipe. I have one problem, where can I get some 3 inch flex pipe at. I only need about 5 feet of it. I found some 4 and 5 inch, but I really do not want to run reducers and couplers to get the job done.
Thanks for your help,
wheelo

 

Most heavy truck shops sell flex. They sell stainless and mild steel depending on where you want it. FYI I was told that flex cuts down on exhaust flow so maybe keep it to a minimum. Also look into using Easy Seal clamps, they are more expensive but are reusable. Just my two cents

 

I planned on using clamps rather than welding it. in case it ever ruted out I could easily replace it in that section. Thanks,
Wheelo

 

Napa and carquest can usually get it pretty quick for five bucks a foot.

 

I get flamed every time I say this, but the exhaust backpressure from 1' of flex is roughly equivielnt to 10' of smooth pipe. Use as little as you can get away with.

 

Is this because flex pipe is corrugated on both sides?

I swear that I've seen flex pipe before with the corrugated outsides and a really thin stainless steel "foil" on the inside to help with the exhaust flow.


I might have some contacts for that stuff. Don't really know how flexible it is, but I swear I've seen it on emissions monitoring equipment.

 

Begle1,
My dad was telling me about the same thing you are talking about. I would be willing to try it, if I could only find it.
I am not too worried about backpressure, I really over calculated my estimates on the amount needed, But still, it is an issue to some. probably some day this week, I might check out my local NAPA or something. Thanks for all the help so far,
Wheelo

 

Backpressure? I thought that the turbo supplied more than enough backpressure.

After all, the big-time sledpullers use velocity stacks that stick out of the hood and feature about two feet of pipe after the turbo... I don't think anybody's going to remove more backpressure than those guys!

 

Guess I'm not tracking with your sardonic wit again Begle.

What I was trying to say is standard flexpipe is very bad for exhaust flow. I have never seen the type of flex that is smooth on the inside, and that type would definitely eliminate the inequity between smooth and flex. Sorry that I was unclear….

 

The backpressure comment was in response to Wheelo's comment;

I need to talk to my dad about that flex pipe stuff. He's got some contacts for that stuff. I take it that the flex pipes on tractors are corrugated on both sides?

 

Don't know....
Only some tractors have flex pipe (assuming you are talking about a Pete and not a Deere). Besides, it would take a jet turbine to flow enough to create backpressure in two 6" pipes!