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What's the most power that's been seen on a tuned rs4 without going down the supercharging road?
Mine is currently 338ps, would the sport cats or a cat delete pipe give much more?

338? Just getting it to run right should get you 40 or 50 horsepower...

Do you mean 438?

Fastest NA I've seen was with a ludicrously expensive and elaborate German ram airbox. They claimed 470-480ps and it was a very quick car.

You have an issue. Most likely a vacuum problem. Need to sort that out first and see what power you've got.

How long ago was the carbon clean?

With your mods and a recent carbon clean I'd expect about 440bhp. Maybe up to 450 with a cat delete. A sports cat won't make much difference if you already have the gutted precats as the standard cat is 200cell same as some sports cats (Milltek do a 100cell too though so slightly less restrictive). If the carbon clean was a year or more ago then I'd expect you to be around the 410 mark. But 338ps is well low (even with a vacuum problem). Do the valves on your milltek still work?

The most I've seen from a NA B7 is about the 450bhp mark which is pretty much the same mods you have but with no cats.

How do you check if your engine needs a carbon clean ?

Apologies, that should of read 438ps

Carbon clean was only done in June last year, yes the valves still work perfect on the milltek, it's pretty loud, if I opt for the delete pipe then I might need to wear earplugs

In that case, you might get another 10bhp from going catless but thats about the limit without charging.

Rs4reilly wrote:Carbon clean was only done in June last year, yes the valves still work perfect on the milltek, it's pretty loud, if I opt for the delete pipe then I might need to wear earplugs

I only asked about the valves as it might be an indication of vacuum issues but now we know you have 438ps then all is good.

Harris. wrote:How do you check if your engine needs a carbon clean ?

You need to get your car on a dyno and get a power test done, if your figures are low then it's time for a carbon clean, unfortunately every b7 rs4 needs this done, poor design by Audi.

MikeFish wrote:In that case, you might get another 10bhp from going catless but thats about the limit without charging.

Cheers Mike, have you heard any with the delete pipes?

Rs4reilly wrote:

Harris. wrote:How do you check if your engine needs a carbon clean ?

You need to get your car on a dyno and get a power test done, if your figures are low then it's time for a carbon clean, unfortunately every b7 rs4 needs this done, poor design by Audi.

Oh right , id have to find someone in Essex to do it then

You have a place near you in Essex Harris,called AMD,go to http://www.amdtuning.com & have a look.

Thanks mate ,are they any good ?

Theres a RS4 on ebay for sale currently, 480bhp n/a mrc tuned it claims. No mention of mods done however.

447 PS for mine!!