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2 1/8" is the stock size, the bends on the stock pipe are about 1 7/8" due to the crush bending. So 2 1/4" will have more volume, and have bends that are around 2" from crush bending which will improve flow coupled with a 2 1/4" free-er flowing muffler.
The best exhaust size for the 3vze would be mandrel bent 2 1/8" but good luck finding an exhaust shop with a mandrel bender (theres one in my province I believe, mind you it's right near my house) and to make matters worse you would have had some divine intervention if you managed to find an exhaust shop with not just a mandrel bender, but also the 2 1/8" dies to mandrel bend pipe coupled with stocking 2 1/8" exhaust tube (which can be found, but it's slightly more expensive because it's an exotic size).
I have a Borla catback and it is 2" mandrel bent and I'd say if you want a bit more torque it's a sweet set up.
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1993 Xtra Cab Pickup | 4x4 | 3.0 - V6 | R150F | Silver-Grey | Amsoil 10w30 synthetic oil | Amsoil Synthetic Drivetrain fluids|
Borla Cat-back Exhaust | OME HD Leaf Springs | Bilstein HD Shocks | Downey Idler Arm Brace | Grey Husky Liners | SR5 Bucket Seat Swap | Color matched Canopy | Yakima racks | Line-X OTR | Michelin LTX A/T 31 x 10.5 x 15 | 323,600 KM's (202,250 miles) | Made in Japan - Vin starts with "J"| Fish on
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