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Has anyone got 'experience' with the following 'too good to true' stainless steel downpipes available on EBay?

http://www.ebay.co.uk/itm/AUDI-A6-RS6-V ... 35db8d11b7

At the price they seem a bargain but are they? Quite a few have been bought...


The next option is the Miltek decat downpipes, which as I'm looking to get the cat back sections from Miltek too might be the safer option. Will I still pass an MOT and are there any potential hurdles and hoops to be aware of? I'll be dropping the engine and having both turbos refurbished / upgraded (slightly) by The Turbo Unit then no doubt remapped, biting the bullet and investing rather than selling now for the long term...

Just gut the precats on your OEM downpipes. Same performance. Even if those cheap pipes are welded properly the main cats will be of inferior quality to OEM at that price point. They're both 200cpi but the Audi ones are actually good.

With decat pipes you won't pass the emissions test. And I would apply the same reasoning as above to the catted Milltek pipes (100 cpi would be touch and go for MOT)

JCviggen wrote:With decat pipes you won't pass the emissions test. And I would apply the same reasoning as above to the catted Milltek pipes (100 cpi would be touch and go for MOT)

Not if you believe the likes of Amanda regarding decat and MOT lol..... Regarding the 100CPI Millteks, I have had them pretty well since I bought the old girl and her emissions have been through the floor at every MOT, they do the job perfectly.

JCviggen wrote:Just gut the precats on your OEM downpipes. Same performance. Even if those cheap pipes are welded properly the main cats will be of inferior quality to OEM at that price point. They're both 200cpi but the Audi ones are actually good.

With decat pipes you won't pass the emissions test. And I would apply the same reasoning as above to the catted Milltek pipes (100 cpi would be touch and go for MOT)

Does gutting the cats affect the emissions too just as though there were no cats? Affecting MOT passability (lurvrly made up word), certainly a cheaper option as Miltek down pipes with cats should be called 'Mintek'.

No, you would only gut the precats. The nasty restrictive 400cpi cats that are located at the front of the downpipe right after the turbo. They're only really there for cold start emissions.

The main 200cpi cats further downstream would remain intact. There's little to gain by going fully catless other than sound and nasty smells.

Gutting the existing DP's takes out the pre-cats - leaving the main cats in place.

If you want a bit more then one can take out the main cats and replace with 100cell "sports cars" - as Footers says, as long as the rest of the tune is spot on you will still pass the MOT.

No cats won't pass the emissions tests.

Technically they should fail you on any of the above as they are supposed to check the full cat system is to OEM spec - but they can't (especially removing the pre-cats).

Gutting the DP's (ie pre-cats) is where the big gains are to be had in terms of exhaust flow. Needs a map to take advantage of this though.

Hope that's clearer!

Dave

Cheers, that's the way I'll go...