Who makes a good flowing 3 or 4 in flew section

 

i got mine from ATP turbo. it was cheap, and its high quality. im happy with my purchase

 

just be sure its braided inside and not ridges, the ridges are a pretty good hp killer

 

Do you have an article or something stating this? I'm not trying to be rude or say you're wrong I'm just interested. I can see where you could get some losses but are they really that big? Let me know if you do. Thanks

 

so 90rexx do you know if the atp is braided inside?

 

eBay

 

Actually, the flex sections with mesh inside should be avoided. It is possible they flow better, but I haven't seen any difference on our dyno. What does happen to them sometimes is the mesh will collapse and leave a very small small opening for the exhaust to get through. This does make a noticable difference on the dyno, making about half the power is a normal symptom.

 

A friend of mine had a flex on his car with the ridges only and it hit a wall during tuning. the place he was at installed a new flex section one with the braided insie overthe ridges and the car picked up 30whp right off the bat and then was able to continue turning up the boost and not hitting that wall. Seems like a ggod thing to me. i personally hav on with ridges but its been on my car for a long time before i knew this information

 

Is there a really good option, other than no flex at all?

Stupid question, but how far down the exhaust would you have to go to be able to put a high quality, high temp silicone coupler on it?

I'm also thinking of trying something like this:

http://www.streetperformance.com/part/flowmaster/exhaust-flex-joint/1398649-15930.html

 

just make a slip fit exhaust...
if you run really good motor mounts the flex section isnt needed, its only there to compensate for the motor rocking. I never ran one on my em1 (solid mounts) nor on my 240 (solid mounts) nor on my crossfire (solid mounts)

no problems ever

 

I can't speak for the OP, but in my case with urethane filled mounts (in a Neon) there is still more movement in the drivetrain than I'm comfortable with unless I have a flex SOMETHING in there somewhere. I have the thought of transferring all of that stress to my manifold studs.

 

I said solids, as in metal... no urethane, no give.
With anything other than solids you need some sort of flex. and a ball joint wont work, thats for misalignment, not front->back movement.

 

Don't tell that to the factory, they seem to find them quite adequate.

 

ok long story short im going to go from a 3 in downpipe to a 4 in exhaust i have filled mounts but it still moves. all flanges will be vband

 

my 3 inch flex from ATP has ribbed inside... i dont see where there would be an issue..... im completely confident in installing it and not losing power.

 

You mean ribbed like a bellows, or convolute or something? That's what mine is like on the inside too, and it sounds like they must create a lot of turbulence that hurts flow. . . or something.

 

Mesh is the way to go, but they blow out occasionaly.
I bought mine from vibrant last time.

 

just try and put it far back on the dp as possible so it wont blow apart from heat or flame from 2step idk