jetman

How much would I gain on my current setup with Longtubes, X-Pipe and some bullet mufflers

pennys58

I am doing that set up and I have been told depending on how your engine takes on the mods gains could be around 35rwhp and probably more around 25-30 rwhp. It also depends on what you have on there now...cut out, catback, shorties...that all factors in because it may not add much more hp if you already have a pretty good set up. Hope that helped.