what is the downsides of bigbore exhaust on a bmw

[scotttollan]

what is the downsides of bigbore exhaust on a bmw e30

[fuzzy]

small cats/rodents could crawl inside at night to sleep and be roasted/gassed to death when you start it up?

[march109]

Well you'd look and sound like a complete prat.

And motorway journeys would be an assault on your hearing.

My scorpian is loverly for the first mile, then its tiresome and tedious.

[scotttollan]

doe's it increase fuel compsumtion?

[Gunni]

low velocity exhaust ( low backpressure ) cause very bad low rpm driving
while it helps at higher rpms, although a stock 325i exhaust is very capable.

[march109]

doe's it increase fuel compsumtion?

Might do but more likely it won't really do anything. Apart from make you look like a corsa kid and a chav. And make your ears bleed.

[AlexBaur325]

Youve got a proper engine with the correct quota off pots....leave it standard.

[scotttollan]

where can i get the stock twin pipe exhaust from and how much are they?

thanks

[maxfield]

Dustbin FTW!

[scotttollan]

lol

[scotttollan]

no honest were can i get one and how much does it cost?

[GrindCulture]

Stick a post up in the parts wanted section, someone might have one.

[Brianmoooore]

Strange as it may seem, BMW sell them! Cheaper alternative is OEM stuff from GSF or ECP.

[reggid]

what ID is the stock dual from catback on m20b25? What about an Alpina?

I have a dual 2.25" from the BTB back but its too large and a bit annoying/drony at low rpms below 1750rpm or so. I have been looking at getting something that suits the BTB secondaries a little closer perhaps dual 2" with something besides the hotdog resonators which don't seem to do much for quieting. I wish the exhaust people didn't throw out my entire (from head back) good condition exhaust what a waste

[Simon13]

Alpina 2.7 system is "big bore" 50mm piping is internally different silencers and is about the only M20 performance that will gain power. Sounds sh!t hot too, like a standard system with big balls, really meaty

Standard 2.5 system is very good, these have 44mm bore piping

So in answer to question yes there is but they are £1300

[scotttollan]

apart from mine it's not a alpina it's just says bmw