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The only real benefit with stainless steel is it's resistance to Corrosion meaning it will last longer and it's stronger....Flow characteristics would be very simular, if not exactly the same as an identical mild steel system.

Edited by Ryanrb25

its in the way the ceramic inner to the cat has been made will flow more than a normal cat that is all nothing special in the steel only that it ISN'T Chinese its Aussie blue steel and or sometimes from NZ

Looks the goods!! Beleive he did some work for Simon as well and that was a great sounding exhuast!

2x2.5 inch pipes is going to flow more then 1x 3inch?? Or so you'd think (5inches of pipe compared to 3 inches makes a big difference)

Personally i'd rather keep the cat and loose a little bit of performance and not cop the massive fine for not running a cat but thats just my opinion

Looks the goods!! Beleive he did some work for Simon as well and that was a great sounding exhuast!

2x2.5 inch pipes is going to flow more then 1x 3inch?? Or so you'd think (5inches of pipe compared to 3 inches makes a big difference)

Personally i'd rather keep the cat and loose a little bit of performance and not cop the massive fine for not running a cat but thats just my opinion

Not quite - area = pi*r^2, so:

3" pipe = 4,560mm2

2x2.25" = 5,130mm2

2x2.5" = 6,333mm2

5" pipe = 12,667mm2

so as you can see, 2x2.5 is definately not as much area (flow) as a 5" pipe by a long shot

^Not necessarily. There has been a fair bit of research (well particularly for V8s) and I think the results concluded there was VERY little difference between twin pipes and singles, and if anything a single was maybe 1-2% better flow from memory.

This is due to the single having less swirling restriction from memory, however for now I can't find the evidence to backup my claims.....

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