E30 Zone

Hi there,

I've got a 320 touring witha bbackbox that looks the worse for wear (so bad i thought it had a single exhaust pipe )

what i'm wondering is that on the GSF website, the 320 2 part backbox is only listed at Ԛ£85.50, but the 325 2 part has a cost of Ԛ£114.50

are these parts interchangabe, and does the 325 one allow better flow/lower back pressure?

thanks

I think..not 100% that that price is for 320i with a single pipe, now I'm not sure which 320i's came with a single pipe, but my 320i touring has got the same 2 piece twin pipe system as my 325i sport had. When I removed the sebring back box from my sport I fitted it to the touring with no problem.

Take a look at your system, if it's a twin pipe (from the front to back) and a 2 piece then it should fit fine.

My 320 touring has a twin pie all the way through, but I don't remember the backbox being over the ton when I replaced it

thanks for the info

its a two piece system on a 1988 touring, so should take either-defo want the twin tailpipe look though

just dont wanna pay Ԛ£114 for it

any more insight would be greatly appreciated-cheers dudes

mine was a 2tlr its a twin pipr, when i changed engine for 25 it was the same fit. since then i have replaced the back box with a nearly new scorpian twin pipe back box. i paid 60 squid on ebay.

thing is ya wanna have a look at it b4 ya buy it. this 1 was 25 mins away so maild the bloke and asked if i went up i could buy it, he was aweet with that. good back box as well, deffo recomend it

No it won't fit because 320's have single pipe all the way through and also the manifolds are smaller, you'd have to fit a 325i manifold if you wanted to fit a 325i exhaust.

Yes it does,my old 89 320i touring had a twin pipe (from manifold) exhaust system just like the 325i.

When i did my engine change to a 325i i used the 325i exhaust manifold and the original 320i exhaust system.All mated up perfectly.

Hammer1 wrote:Yes it does,my old 89 320i touring had a twin pipe (from manifold) exhaust system just like the 325i.

When i did my engine change to a 325i i used the 325i exhaust manifold and the original 320i exhaust system.All mated up perfectly.

Well maybe someone fitted a 325i exhaust to your 320 before you got it.

Adam, if you look at the ETK, you'll find that 320i/325i share the same manifold. I've got a 325i exhaust on my 320i and it fit's fine.
Some 320i's have got a twin pipe system.

E30Adam wrote:

Hammer1 wrote:Yes it does,my old 89 320i touring had a twin pipe (from manifold) exhaust system just like the 325i.

When i did my engine change to a 325i i used the 325i exhaust manifold and the original 320i exhaust system.All mated up perfectly.

Well maybe someone fitted a 325i exhaust to your 320 before you got it.

Nope totally original from factory,a unmolested example until i changed the engine and found out the exhaust system are interchangeable on the 6 cylinder tourings (saloons might be different??)

I just checked 320i/325i touring and saloon, and they all show the same part number for the exhaust manifolds.

There are definately 2 different manifolds, perhaps later 320's came with the same manifold as the 325??

The other manifold is DEFINATELY smaller, there's a different gasket exactly the same shape but 1cm shorter.

its true, there are 2 exhust manifolds, Datourer and i have the 2 peice set and others have the single cast peice.

mine had a double downpipe set into the mid box, and exits as a single to 318 looking back box

it was a three peice arrangement, rear secion was removed and replaced it with a custom twin pipe style

My 89 chassis definitely fits the same manifold and exhaust as 325 - I had a 320 engine with 325 manifold and exhaust system and now have 320 engine 325 manifold and 320 exhuast, i had checked that the manifolds were the same part number on ETK and RealOEM.
to explain the chassis started off wiht a 325 engine which was replaced

I've a '89 320 Touring auto in the workshop, parked above a '89 325 Touring manual. The exhaust systems are identical down to the position of the spot welds.

thanks for all the info guys!

gonna go with what brian moore says-so the exhausts are exactly the same.ergo i'll buy the cheaper


THanks!

320Touring