8 replies to this topic

[mozzo1]

im making my own system untill after mot when ill be bying stage one kit but for now im flat broke so wiil it be ok to have two different size pipes joinded together by squashing one end to fit to smaller one, and honestly this dost look as bad as it sounds, my thoughts are as long as not too loud and my welded joints dont leak then its ok, is this right or wrong ??

[dklawson]

In the U.S. that would certainly apply. Exhaust systems for our street vehicles must be made of continuous pipe and where joints are present they must not leak. There is no requirement for exclusively factory exhausts. The exception is that on vehicles where a catalytic converter was fitted, the new exhaust system must retain the cat. I'd think your laws would be similar.

[mini_mission]

I would have thought it would be fine as long as its welded up ok with no holes and it has some sort of muffler on it and a catalytic converter if applicable.

I made a twin exit exhaust up for a mini van I had- I used scaffolding pipe and an old volvo backbox, lol I loved that rusty piece of junk...

[Guess-Works.com]

We're always bodging exhausts, putting bike cans on the back seems to be a common favourite...

[Bungle]

as long as it doesn't leak or fall off should be fine

[998dave]

The laws to sell a new vehicle are a lot more stringent then those when you modify one.

On new vehicles:
All exhausts leak, but it's a case of measuring leak over time.
Tailpipe must exit beyond the last welded seam and beyond the rearmost opening of the passenger compartment.
Vehicle must pass drive-by noise simulation and testing.
Emissions levels, depending on vehicle spec. market, and year of manufacture.

For your mini however:
Must not leak excessively.
Must not be excessively loud, (later cars have noise regulations).
Must pass emissions requirements.

So you should be fine to squish and weld, how much are you squishing by? You could squish weld, then roll a conical sleave round the joint and weld this at both ends to tidy up and make sure. But as long as it's neat and not too loud you'll be okay.

Dave

[mozzo1]

[quote name='998dave' date='Nov 12 2008, 03:45 PM' post='1216150']
The laws to sell a new vehicle are a lot more stringent then those when you modify one.

On new vehicles:
All exhausts leak, but it's a case of measuring leak over time.
Tailpipe must exit beyond the last welded seam and beyond the rearmost opening of the passenger compartment.
Vehicle must pass drive-by noise simulation and testing.
Emissions levels, depending on vehicle spec. market, and year of manufacture.

For your mini however:
Must not leak excessively.
Must not be excessively loud, (later cars have noise regulations).
Must pass emissions requirements.

So you should be fine to squish and weld, how much are you squishing by? You could squish weld, then roll a conical sleave round the joint and weld this at both ends to tidy up and make sure. But as long as it's neat and not too loud you'll be okay.

Dave
there is about 3/4 inch difference in the two pipes, so after there joined should i wrap a piece of metal round it to tidy it all up, im using peco back box with the standard middle box from my mini just hope it sounds ok but then its only gotta make do untill after xmas as my three kids wont be happy xmas morning if there laptops dont turn up but daddy has a nice sounding mini lol

[mozzo1]

i dont know what i done ther as my reply has gone on to end of daves reply (newbe to pc)

[998dave]

you quoted me.

By the way there is a magic adaptor pipe you can get to do this job.