What diameter pipe do I need to weld into the stock headers in place of the cats?
I was told at one point 1 & 5/8" pipe. Is that correct?
I see 1&5/8th for the 2 to 1 collector. The 3 to 1 collector is larger will report what diameter I use when I get to those
You may be able to just gut the cats one by one to make it simpler. Not the same I know, but just an idea.
Any good methods on gutting the cats? Also will I need a tune if I gut the cats? Thanx in advance.
There are two good ways of going about this.
- Just cut the can and use an air hammer and just remove the material. Easy works great still adds a ton of power.
- doing what laketahoe did. That requires a bit more work and precision.
Removing the cats is a very smart way to extend the life of the motor and add a good chunk of power. The cats on these cars tend to go bad.
You will need a tune and I and I think everyone else will highly recommend you get the JHM ecu and TCU tune. Its totally worth the money you spend and you’ll get R8 like results.