[84chevyguyid]

I used all the exhaust from the school bus that the engine came out of and yes it is 4 inch all the way back. had it straight piped but when I put the bed on and found out I needed to drop the hitch a bit which then got it too close to the exhaust, I removed the pipe out from in front of the axle back and redid it over the axle. I havent put it back in yet but since its apart where a muffler would sit I am going to put a muffler in when I put the exhaust back together. My nephew put a complete 5 inch MBRP system on his 04 and I love the muffler on it, sounds great on the outside and quite on the inside and doesnt have a drone sound at any speed so I think I will get the 4 inch version of it for mine.