2.25" and straight through is the first mod I ever did (circa 2000), like Thomo I wanted mine to sound like a Jeep not a car. I have since then added the Extracters etc. (as the pre 2001 exhaust manifolds are crap, they nearly all crack at the Y ) but I have stuck with 2.25" not 2.5" as I like a little more back pressure for going down the hills (its better, supposedly???)
For those QLDers interested in choppin off their pipes directly after the Muffler, think about this!!!
From the QLD TPT site on Vehicle Mods.
The exhaust outlet must extend at least 40mm beyond furthermost outboard or rearmost joint of the floor pan which is not continuously welded or permanently sealed which could permit direct access of exhaust gases to the passenger compartment, but not beyond the perimeter of the vehicle when viewed in plan.
The exhaust outlet, if to the rear of the vehicle, must discharge at not more than 10 degrees above or 45 degrees below the horizontal.
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2000 TJ with stuff
1949 Willy's CJ3A, with Koenig twin-stick dual output PTO - Project 'Farm Jeep'
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