stainless exhaust system?? 325i

Post Wed Feb 23, 2005 5:59 pm

i've recently bought a scorpion backbox and i want to replace the whole lot really but as i've had an engine conversion done i dunno wot i should have on it, my car is a k reg, but the engine has no cat!! and the old system that is on there is a 3 piece system, seen some link pipes on ebay and a centre sections, but will they combine? or when u buy a scorpion do u just do away with the lamba sensor?

please help!!

Post Wed Feb 23, 2005 7:50 pm

The scorpion back box, is it from a 3 piece or a 2 piece?
Have you ever had any problems MOT'ing the car previously with no cat? Your car should be fitted with one legally (Kreg Aug 92 on), but if your MOT tester isn't bothered then your fine.

Post Wed Feb 23, 2005 8:03 pm

3 piece, mot due in may!!??

Post Wed Feb 23, 2005 8:10 pm

OK, so what engine conversion have you had done? 2.0-2.5?

Post Wed Feb 23, 2005 8:16 pm

Iv'e got a full scorpion system on my other convertible. I think its an excellent product. 3 piece system with Lemans back box. Dont think its got a cat on and iv'e never had any problem with the MOT. Can be a bit on the loud side when you hit the gas!.

Hope that helps.

Cheers Gareth.

Post Thu Feb 24, 2005 6:38 pm

325i conversion i've found this on ebay http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... Track=true
plus centre section http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 79830&rd=1
will these link together?? i have asked the seller but i've had no reply!!

they look simmilar to wots on there but ??? who no's??
cheers Ben

Post Thu Feb 24, 2005 7:59 pm

luxconvertible wrote:325i conversion i've found this on ebay http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... Track=true
plus centre section http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 79830&rd=1
will these link together?? i have asked the seller but i've had no reply!!
they look simmilar to wots on there but ??? who no's??
cheers Ben

The centre section for sale there is for a car with a 3 piece exhaust, the link pipe is to fit a back box from a 3 piece system to a centre section from a 2 piece system. These 2 parts won't go together.

Post Thu Feb 24, 2005 9:23 pm

Your 100% right Simon yet again, that centre section is the same as mine. I bought my backbox and centre section second hand and the manifold from Motech full price!.

Cheers Gareth.

Post Thu Feb 24, 2005 9:29 pm

Just noticed the seller, Prima Racing thats the company where mine came from!. I have the original invoice. They should help you mate.

Post Thu Feb 24, 2005 11:57 pm

There is no legal requirement for any car of any age to have a cat. There is, however, a requirement for any car to meet the emission standards prescribed for a car of that particular age. My M20 325 touring although pre '92, meets the requirements of post '92 cars without a cat, because it runs n LPG.

Post Fri Feb 25, 2005 12:07 am

Brianmoooore wrote:There is no legal requirement for any car of any age to have a cat. There is, however, a requirement for any car to meet the emission standards prescribed for a car of that particular age. My M20 325 touring although pre '92, meets the requirements of post '92 cars without a cat, because it runs n LPG.

So the cars registered after Aug 1992 K plate legally requiring a cat law has been abolished?

Post Fri Feb 25, 2005 12:53 am

Many people with post '92 LPG powered cars run without cats. It's the emission levels that the law requires, not the presence or otherwise of a cat. For duel fuel vehicles, the MOT test is carried out usuing the fuel on which the car is running when presented for the test.

Post Fri Feb 25, 2005 9:48 pm

Hi, I have a 1991 325 auto with a cat, bought a scorpion DTM stainless steel 3 piece system for it without cat ,fitted it removed the LAmbda switch , Ran it for 3 monts ,if you do any with cat and take off lambda switch you will
1. increase fuel consumption.
2. Get no noticable power gain.
3. Increase noise.
I was also told by BMW garage where it is serviced that as it was originally fitted with a cat it would fail its MOT , took it to MOT station where it has had last 2 MOTS who confirmed this.
I have now put on original BMW complete exhaust with new CAT (cost just under( Ãƒ”šÃ‚£1000) .

If you still wish to go ahead I have the full 3 piecs scorpion system for sale ,(taken off car 3 weeks ago ,needs quick clean up) have original invoice) with all brackets and long bolts for rear box straps . Ãƒ”šÃ‚£200 for the lot (half price of new )