My New Am Perfomance Exhaust

[Damo_R34]

Steve, whats the advantage a having 2 pipes? Is it just for better sound?

[Madaz]

instead of having 1 large pipe to get all the flow out of ive gone for a split to keep it high off the ground whilst keeping the flow something a little different too

[SLAPS]

Twins typically are not as loud as a big equivalent single but flow just as well.

[rad100]

looks good.. should have got split dump fornt pipe and continued it...

will be good to hear and see in person!!

[heslo]

Oh beleive me, they are loud

[Damo_R34]

ahh awesome, look the goods

[Madaz]

yeah im getting custom baffle's made up just like Pete can put in the GTR when he knows he wants it a little quieter

[SLED]

yeah I better go and see him as well before I get too carried away with my future plans

[Ryanrb25]

Andrew's workmanship is second to none...he did some work for us at my old work, and we did work for him.

Much rather a big single. There would be no performance gain unless your last exhaust was f*kn shit.

[IZZMO 33]

Get rid of the cat...... performance killer right there

[Madaz]

na not much on one of these exhausts

[IZZMO 33]

how so???

[SLAPS]

Mild steel apparently sounds a tad better/deeper and is less likely to drone due to the wall thickness.

Not sure if there's any truth in it.

[Ryanrb25]

I'd love to know the reasons why stainless flows better than mild steel...do tell...

[Ryanrb25]

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 December 14, 2008 by Ryanrb25

[Madaz]

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

[Boof]

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

[Hotwire]

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

[CRoNic...]

2 pipes would be better for twin turbo setups, right?

1 pipe for each turbo?

[Hotwire]

^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.....