I do have an intercooler, it's 27x9x...3 I think. There lies the benefit of huge SDL bumpers! Anyway, I made my exhaust myself, it's a 3" with just a Thrush Hush muffler. It is surprisingly quiet, like not really any more loud than stock, at least from my driver's seat perspective. I may have some drone around 1700 but I am 98% sure it is because the downpipe vibrates on the body from time to time. Still need to fix that.