what dia exhaust system for the s50b30

[irish320i]

thinking about possibly building my own system see how i get on wud be good to see how it goes but i was wondering what size pipes would be best and were do people get the parts from could be a difficulty getting shipped to Ireland but worth a try
Alan

[Gunni]

stock is "2.25 x 2
find a custom exhaust shop and get material from there if you are going to weld it up yourself.

[irish320i]

cheers for that just trying to work out what it will cost to make it up if its is nt too much it ll be worth a go to see how it preforms
Alan

[jaistanley]

I worked out that you'd need a 2.1" system throughout. The BTB manifold is twin 2" outlets so I'm going to run that all the way through using the BTB manifold, a Supersprint E30M3 backbox and a freeflowing custom centre section to match.

Dameon has the full BTB system at 2" throughout and it works excellently, making the full quoted BMW torque and power. Not bad at all considering the manifolds were adjusted to fit (by BTB)...

Good luck dude.

Jai

[Karan]

i think Ian aswell as myself is running twin 2.5 in pipes.... mine's a tad loud though

[irish320i]

Is the fact you s are running without cats not giving a gain or is it just making up for the fact that he manifold is nt quite what bm designed what box did you use in the centre section Jai
Cheers Alan

[Gunni]

B32 has 2x "2.5
B30 has 2x "2.25

I got 275hp@7k(stopped by the speed signal not beeing connected, was still rising) using "2.25 and 330nm torque@3750 on my B30

[irish320i]

there nice figures gunni 2.25 is perfect for the b30 what sort of system are you using on your s
Cheers Alan

[Gunni]

I was using a what was supposed to be a

"2.25 header pipes into a single "3 collector, then again into two "2.5 pipes leading to a custom made silencer in the back, .

turns out when I took it off years ago, the "3 was only a "2.5
and it turns out that it is one of the reasons my engine used to knock and my valves burned,.
so don´t restrict the exhaust.

I´ll be using 2 x "3 when I use a S50 next time around

[Karan]

I was using a what was supposed to be a

"2.25 header pipes into a single "3 collector, then again into two "2.5 pipes leading to a custom made silencer in the back, .

turns out when I took it off years ago, the "3 was only a "2.5
and it turns out that it is one of the reasons my engine used to knock and my valves burned,.
so don´t restrict the exhaust.

I´ll be using 2 x "3 when I use a S50 next time around

thats gonna be loud!

i think my primaries are only2in each..same as stock e34 m5 manifold?

[Karan]

in hindsight i should have gone bigger like ures, but bottom end and mid range torque at the moment is awesome!

[irish320i]

Gunni
turns out when I took it off years ago, the "3 was only a "2.5 so your system was basically restricted to singlle 2.5 how much damage did it do to the engine think ill be going 2x2.25 or 2x2.5 2x3 is just rediculous think it s only a single 3 on my sub and that massive
Alan