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Selling my ported LS6 DBW throttle body off of my 26k mile C5 Z06. I had it ported by New Era Motorsports just last year, I will include the receipt. Works 100%, no issues whatsoever. I removed it and my LS6 manifold in favor of a 90/90 setup.
I didn’t do a before/after so I don’t know. I did notice improved throttle response which was nice. I’m sure it helped some, car made 436rwhp/415rwtq with just that, Vararam cold air, full exhaust and a 228/232 cam.