Cat Removal And Tune?

[nut161]

ok it seems my aps cat has had a big death and I dont have the spare coin with xmas and all at present to get a new one.

so I was thinking so I can drive the car in the meantime of removing it, punching the guts of it out and welding a 3" pipe inside it then reinstalling back to the car. will the extra flow mess with the tune too much?? the car used to make 327rwkw before the car started to go and now its completely undrivable.

yes I know its highly illegal but need a car asap and this is only a 2 month max dilemma

Edited 16/11/08 09:54 PM by nut161

[jet_paul]

you will need a tune.

Even though it is highly illegal and you will get raped if you ever get caught.

It will probably be the best mod you will ever do.

[Guest]

Depends how well the APS cat flows as to whether or not you'll need a retune mate. If it flows nearly the same cfm as a 3" straight through pipe you'll be fine but it's highly unlikely.

Throw it on the dyno to be sure

[kevo]

yer try to drill a 1" hole through the middle of it in the mean time so you don't have major over boost issues. I imagine you definately will if you remove it all together.

I know of 'someone' boring a 1" hole through the middle of their APS catalytic converter this weekend before it gets tuned the following day, so I might be able to ask 'them' how it worked out

[Guest]

Why wouldn't they just punch the whole lot out? It's still illegal to have a 1" hole so might as well go for gold seeing as the outcome would be the same after being nabbed

[nut161]

finished gutting the cat tonight and reinstalling it. the car is making 17 instead of 15psi now, nothign major but ill baby it about till I get a new cat and its back to normal.