non-res standard kits 3" diameter piping.
side note -
On my Stock SVT (just K&N) I have the same kit being offered on discount. I get no rasp in winter or summer. Real nice mellow tone on idle. The only thing thats annoying is on the interstate doing like 70-75 hearing the constant tone of the exhaust kind f sucks after a few hours on the interstate. When I get my 3L in and headers and opt y, i think I am going to get some res. just becaus eI think it will be too loud with the whole exhaust opened up, up front.
