vr6_super 0 Posted February 3, 2010 Report Share Posted February 3, 2010 buying a new cat back system but unsure of which diameter i should be getting, i phoned rms in ayr and they said its probably the 2.25in whereas some threads i read say its 2.50in.personally not bothered as long as its easy enough to get adaptors to make whichever one fit but does it matter performance wise? obviously the wider the system the more airflow, true? Link to post Share on other sites
vr6stormt 0 Posted February 3, 2010 Report Share Posted February 3, 2010 bigger less resrictive? Link to post Share on other sites
Dazdub 0 Posted February 3, 2010 Report Share Posted February 3, 2010 Thats right mate. The bigger the diameter the better the flow. Should get more power aswell Link to post Share on other sites
vr6_super 0 Posted February 4, 2010 Author Report Share Posted February 4, 2010 tho is the standard system a 2.25" ? i'm not planning on getting a new manifold and i'm guessing i can pick up a connection for the 2.25" to 2.5" easy enough? Link to post Share on other sites
vr6stormt 0 Posted February 4, 2010 Report Share Posted February 4, 2010 im still running the standard mani,down-pipe and de cat but a couple of weeks ago i took every thing out from the cat back and got magna flow to supply all the pipe and bends in 2.5" for less than a £100 sounds and feels wicked. Link to post Share on other sites
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