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Originally Posted by STINKY NINJA
A single 3 inch would probably flow better than the stock exhaust with its super restrictive mufflers anyhow,not that im saying to get it because ground clearance may be an issue.
Ideally get a custom 2.25 twin with an x pipe 2 mufflers(centre) and 2 hotdogs(rear) i used to have a custom twin 2.5 with an x pipe and only 1 magnaflow muffler per side and it was a bit sluggy down low and sounded pooey and droned,was on a stock 220kw,was just too big for a stock windsor imo.
Ill say this though,it was the nicest symmetrical looking,shiny exhaust ive ever had on any of my cars,glad i never paid for it lol.
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Originally Posted by STINKY NINJA
Soundwise it evens up the note between the 2 separate pipes and sounds alot better than a twin sytem with no balance pipe or x pipe,performance wise im not sure,i also had another 220kw xr8 with a twin system with no balance or x pipe and it was the worst sounding exhaust ive ever heard,almost like an old 253 thong slapper,very bad sound...
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This dude is on the money.
2.25" is the ducks guts for the 5L, and they absolutely need a balance pipe.
2.5" would work well from the headers and in the mid section, but the tailpiece must be 2.25".
Making the pipe smaller as the gas travels encourages flow.