I currnently drive a 1998 A4 2.8 and am considering purchasing a used 2005 A4 1.8. However, when I took it for a test drive I was somewhat turned off by the turbo delay and the initial sluggishness. Does a chip make a substantial difference? Is it worth the $ and what kind of increase in performance will it actually provide?

Yes, best money you can spend...check APR, REVO and GIAC websites, they will provide you with all the info you need on power gains. I went REVO and have no regrets

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02.5 A4 1.8TQ
-I've done some shit to it

Yes it is worth it, It brings the car back to life. I have had it done for over a year now and love every minute of it.

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http://www.cardomain.com/ride/2411240/

05' B6 1.8TQ Tiptronic

By the way, anyone heard about Unitronics???

Never heard of Unitronics. I went with REVO, and love it! The stock 1.8t is notoriously slow, but once chipped, it's pretty fast. Oh yeah... once you do decide to get it chipped, also get a new DV at the same time (I went with a Forge 007).

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03' A4 1.8tqm
Denim blue

I think I'm getting the bug as well...for a chip that is. Whats the MPG decrease with the REVO chip?

APR, cheapest way to get 65 hp and 100 ft lbs tq

PM manguyen on audizine for OEM 386cc injectors much cheaper than on APRs site

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APR 1+ Stasis StreetSports/Center Diff Neuspeed Exhaust/TP Podi w/ VEI Digital Gauge JHM Short Shifter Southbend FE SS Racetec FMIC Apikol Snub 6000k HIDs

2004 AUDI A4 1.8T UltraSport

Yeah, my question is about the MPg as well, after chipping. I am presently filling premium ( 91 or 93) and am getting 24 city, 33+ on the highway. Assuming my driving style doesn't change much after chipping, would my mileage stay aprroximately the same?

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2005 A4 Quattro

^^^ Eventually it should go up!!!

if you drive conservatively, yes about the same but your injectors are bigger so you will lose a couple MPG but not much, however you will enjoy your newfound power and therefore drive harder... its defintely worth it though... if you drive easy, you should still get 30+ mpg

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APR 1+ Stasis StreetSports/Center Diff Neuspeed Exhaust/TP Podi w/ VEI Digital Gauge JHM Short Shifter Southbend FE SS Racetec FMIC Apikol Snub 6000k HIDs

2004 AUDI A4 1.8T UltraSport