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Re: exhaust size ??
I have 3" running thru Borla XR-1 race mufflers on a 300HP 350, with no problems at all. They're a little loud with exits in front of the rear wheels, but as far as horsepower losses from them being too big are zero. I had 2.5" before thru some cheap-o turbo mufflers and I couldn't squeak 3rd gear, now I can. I have the back pressure in the headers though. My header primary is only 1.5" compared to some that are 1.75". Hope this helps. Jeff.
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1965 C-10 Short Fleet 468/TKO 5-Speed
2004 2500HD Crew 496/Ally Blacked Out (SOLD!!)
1997 Formula WS6
2004 Jeep Wrangler (Sold)
2013 Jeep Wrangler (Sold)
2017 Jeep Wrangler (Blacked Out on 35's)
2011 GMC D-Max Dually Denali 3500HD (Sold)
2015 GMC D-Max Dually Denali 3500HD (Sold)
2018 GMC D-Max Dually Denali 3500HD (Sold)
2020 D-Max Dually Denali on 33x12.50's
1979 GMC Short Bed Step-Side 4x4 350/350 Low Miles
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