I am tearing out my stock exhaust system and I want to straight pipe it from the aftermarket headers right to the muffler( with pre-silencer). Is there any problems that could result from doing this? Like will any ports close? anything? I'm trying to get this project started very soon so I'd like to know before I start. Thanks!

 

ya same question will it effect the seals without the back pressure

 

S5 i doesn't matter, S4 will screw around with your 5/6th ports.

It will also be very very very very very very very loud.

 

well i have an 86 so it will screw with the ports... what can i do so that it wont?

 

well you have a couple options. but ill just tell you the easiest one. racing beat has the header with the pick up tube in it so it will make your ports open for you./

 

alright cool. thanks.

 

What seals? Engines don't need backpressure to run. The only reason it will affect an S4 NA is due to the auxiliary port actuators needing exhaust pressure to open.

 

true that. look at those sprint cars. they just run striaght off the headers. nothing more. just loud as ****. no back pressure either so yea you should be doog

 

i just got done with my exhaust, i used a racing beat header, and a borla cat back, with a custom pipe connecting the two. im going to use my air pump to operate the 5th/6th ports.

 

so if i leave my air pump the ports will stay open?

 

i just wired my ports open it will only hurt you bottom end a little bit though only bad thing bout it

 

No, you need to convert your 5th/6th ports to work by the air pump. It won't do it automatically.

Or you can just buy an exhaust that has the pickup tube already accounted for and leave the stock system.

 

Why get rid of perfectly good 5th/6th ports?

You make yourself a slower car, and lose a pretty sweet functionality.

 

Ehhh screw wiring the ports. I'm just going to go with the headers that have the pick up tube. It's so much easier. I'm probably going to remove the air pump since I'm removing the cats too and I'm going to get a dual belt pulley for the alternator.