Exhausts

[Timbo]

Actually, it peaks at 18psi, and averages 16psi through the powerband, FWIW But that wasn't the point of my post at all.

My point is that we have posts revisiting issues. There's a very hand FAQ and DIY that PoloGTI spent quite a bit of time putting together, which centralises most of the information being sought, and to which new owners should be encouraged to refer.

[hkogti]

Anyone knows whats the diameter of the standard exhaust?

As most of your guys think that the stock exhaust is pretty free flowing, do you guys thinks its ok to leave themiddle pipe stock and change the rear box for sound and dump pipe for power? Or it will yield significant power with the replacement mid pipe?

[Blitzen]

Anyone knows whats the diameter of the standard exhaust?

As most of your guys think that the stock exhaust is pretty free flowing, do you guys thinks its ok to leave themiddle pipe stock and change the rear box for sound and dump pipe for power? Or it will yield significant power with the replacement mid pipe?

The stock diameter is 2 1/4 inches. The middle assembly on mine(07 model) is the Catalytic Converter, then its free flowing to the fear muffler and twin pipes...I have no middle muffler, but I think early model Polo GTI's do(Don't hold me to that!!).

[GT3]

...then its free flowing to the rear muffler and twin pipes.

The rear muffler isn't free-flowing, it has 3 chambers so it's definately a restrictive muffler.

[Blitzen]

The rear muffler isn't free-flowing, it has 3 chambers so it's definately a restrictive muffler.

Like I said in my original post "...It is free flowing to the muffler..."
Not the muffler itself...

[Timbo]

The most restrictive part of the stock exhaust system is the dump pipe bend into the cat. It's 2.25", and at that bend, the width is effectively less than 2". That's why installing a custom dump pipe (say, 3" to the cat) or something like the APR dump and hi-flow cat liberates good power on chipped cars.

[hkogti]

So that the middle silencer can be ignored and just get a dump pipe and rear exhaust? Isnt that bigger middle pipe helps too? As the stock one is only 2.25", a 3" would be nice isnt it?

[Kai]

Hacksaw!..