So you reckon i go for 2" or 2.25"? Thanks for the help. Because iv been quoted 2" CAT back lukey system $350. i was just wondering if the 2" was the standard size of the original pipe. cos then i wont get it il go to another exhaust place who can do 2.25" for the same price! Hey Corzza. I spoke to the guy @ castle hill exhaust ... and this is what he had to say ??? "2 1/4" exhaust, using resonator, straight through muffler. it will have a nice tone and costing would be between say $280 to$310 depending on the style of tip you choose." what do the rest of you guys think .. I have a 1zz .. i dunno about corzza ... are you 1zz as well ??? im still up to get this done around late jan early feb if we push him on the price for 2 of us Yeah is that CAT back? im levin yeah 1zz. Im keen! U must hear my race pipe bro!