Muffler..or...no muffler

[51jay]

Stock R33 at the drag strip Am I going to get any benefit by simply removing the exhaust,up to and including the cat, would the car even run properly. Also whats the rev cut on the stock car....it's a long time since I had a Stockky

[Revhead]

On a bone stock 33, I believe you would gain some power removing the horrendously restrictive exhaust. I've heard that not putting the second sensor (after the cat) back into the exhaust can cause it to burn out though, but I have no idea whether that's true or not! If it already has a good cat-back exhaust on it, it's probably a waste of time. That said, I put a drop pipe on mine when I head out to the drags. It sounds farkin awesome, and it feels quicker too (I know it's just cos it's making more noise, but it does "feel" quicker).

[FATGTS-R]

If it means anything, my friend has a ridiculously modified holden rodeo. In street trim the exhaust system is obviously not going to be a restictive set up.

But for calder a pipe straight out the side nets about 10-15 kw, but this is with altering the mapping as well.

[awurth]

My 33 was a 230RwKw with no cat and putting it back in made it a piece of Crap. If the exhaust system is straight through removing the cat and putting some pipe in it's place will help a bit. if it's a stock exhaust i've got no idea then.