Quote:
Originally Posted by M5 TT
I have done this on a few cars and although seems to work well, given the power you have it might be worth doing some flow calculations? Gutting your cats will slow the gas flow as it goes from 2.75" to 5" diameter then back to 2.75" ( I am just guess pipe sizes I have not measured the downpipes) and possible cause back pressure wave (just like a 2 stroke expansion chamber) robbing you of flow and power.
Oh and I will have your downpipes when you sell them  Mine is 2015 so don't think it will have wastegate rattle being electronic control |
you'll still get waste Gate rattle, mines on a 15 plate. nothing you can do really apart from go high flow cats