E30 Zone

Full stainless system with DanThe polished 6 branch.

How big is the single pipe? Looks a bit small

How does it sound?

Must sound good and fairly quiet, I was advised the same single pipe design today at a custom exhaust garage. Mine is twin pipe all along and its a bit too loud... a sound clip would be nice buddy, nice car btw.

ross_jsy wrote:How big is the single pipe? Looks a bit small

2.75 inches

JF008 wrote:Must sound good and fairly quiet, I was advised the same single pipe design today at a custom exhaust garage. Mine is twin pipe all along and its a bit too loud... a sound clip would be nice buddy, nice car btw.

Sounds excellent, just a real 6 cylinder bmw sound but emphasised obviously almost a rasp off it when climbing the revs!

Can be driven relatively quiet at low revs but when you accelerate and then leave off it still makes that popping noise if you know what I mean

I'll do a sound clip tomorrow

Twin pipe system through out the system is the right way, not single from middle box.

bhups wrote:How does it sound?

Sounds brilliant, almost like raspy sound as its climbing the revs but not crazy loud, id recommend a vortex

bmandy68 wrote:Twin pipe system through out the system is the right way, not single from middle box.

You should hear my car! went to have more baffles added today as noise level were too much on long journeys... can't say it changed anything too much. I was told a single pipe from the middle box is the way to go to slow down the flow, to reduce noise and kill the resonance in the cabin.. Less power (not much) but it makes for a more refined chariot

The Vortex box is supposed to improve power by its design, a power map would be good to see

bmandy68 wrote:Twin pipe system through out the system is the right way, not single from middle box.

Do you know what I'll do I'll go back and tell the exhaust experts that they are wrong and your right!

DanThe wrote:The Vortex box is supposed to improve power by its design, a power map would be good to see

Do you mean just a standard dyno test with a power curve?

Every after market exhaust built for 320/325 i have seen is a two pipe system ,and the stainless sytem i had build by company in sutton in ashfield in notts also said, better to be two pipe system.

Looks spot on Hop Chop. IIRC BTB favour a single pipe system too and nobody can argue they don't know what they're doing

Yep, the BTB M20 exhaust uses single pipe mid to rear, defo not amateurs

lets hear it then...youtube it

If btb make a single pipe system you cannot question them,sorry Hopchop to be honest i had only seen two pipe systems and i was wrong i do apologise.

Any idea what kinda horsepower may be avaliable from a vortex system and a power map.

bmandy68 wrote:Any idea what kinda horsepower may be avaliable from a vortex system and a power map.

http://www.vortex-performance-exhausts.co.uk/raceflo