drew2.7T

I am thinking about a Milltek cat-back exhaust for my 01. (It has an 02 rear bumper)Anyone know how much horsepower gain I would get? Milltek claims 12 to 15 HP? I am not planning on chipping. Thanks in advance!

paulroad

but your turbos may spool up a bit faster wich will give you power a bit sooner. Exhausts are about look and sound..more than power.

2.7Twin

^^^^^^^^^What he said!^^^^^^^^^^

ZIPPYGAS

I did the chip and did notice a big difference over a non chipped (obvious) but soon became bored and tried the milltek and felt a huge gain in my butt dyno. It felt to me almost as much as the gain from the chip. I did the chip 1st so I'm not sure how much gain you would get without the chip...

MCH 2.7t

2 years ago when I chipped and added a Milltek cat-back, I dynoed after each change. The first graph shows stock v. a GIAC S chip

<img src="http://pictureposter.audiworld.com/68483/a6_dyno_stock_v_giac_s_7_8_04_v2.jpg">

The next graph shows the S chip + the Milltek

<img src="http://pictureposter.audiworld.com/68483/a6_dyno_giac_s___milltek_7_11_04.jpg">

Several caveats - The dyno runs were done in 100 degree weather. We were getting a lot of heat soak, which made it difficult to get good runs. This dyno is also known to be "optimistic".

Bottom line, the chip and exhaust make a significant difference. The exhaust on a chipped car makes a difference. I never dynoed the exhaust with the stock chip, so I can't answer your specific question. Lots of anecdotal evidence seems to indicate that you will see modest gains in hp and tq, but that you'll need a chip to really open it up.

HTH