I bought an 08 A4 2.0 6 spd manual in January and it came with a full Milltek Stainless Exhaust (No Catalytic Converter). I have since replaced the stock filter with a K/N and I cannot find any notes on how much horsepower gain these mods would have.

My guess is 20-30 horsepower; Any ideas?

Thank you in advance.

 

i'd say 10 HP gain. milltek is nice **** so the guy you bought the car from had good taste for quality. you should seriously consider getting the APR stage 2 ECU flash. it is perfect for catless aftermarket exhausts. i think you'll get ~50 HP over stock with that ECU flash and your existing exhaust.

 

Air filter power gain = 0, period.
Catless gain maybe 2% = 4 HP.
We are not in the 50s anymore.

Do you know how much HP requires your AC to run?

 

Ac probably 10%. I almost did the ECM flash when I got my tax return,but decided to hold off.I was afraid it would shorten the life of the turbo. This is my first Audi so I'm a little skeptical.

 

The most gains come from a testpipe or High Flow Cat, mated with a aftermarket downpipe, the gains from that are similar to what you posted 20-30+hp. I think RAI claims the most gains.

 

Thanks for the posts.

 

the audis already have RAI (ram air intakes)

 

Catless Is probably 10-15 horse there. Rest of the exhaust probably nothing as we have decent stock piping. Air filter next to nothing on these cars. A stage 2 flash from apr or revo will net you anther 50 ish. Well worth it.

Do you have an engine light? If not and catless is may have a ecu tune already as no cat will throw an engine light.

 

RAI is a company. http://www.raimotorsport.com/default.asp

 

No check engine light and I thought the same as you 2wdblazer. I wish there was a method to check if a ECM has been updated.