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I just got an 89'325i, 2d, 5spd. I've have been into mustangs for awhile but here are my questions.
1. What do these cars run in the quarter mile?
2 What are some basic mods?..and what really wakes them up?
3. Aftermarket shifters??
thanks for the help.
 

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1. Who cares, its a bmw not a pos

2. -Upgrade the entire exhaust to the dual IS exhaust, That will run you about 100 or so at a junkyard.
-4.10 rear differential helps, not worth the money unless you find at a junkyard for a good price
-Supposedly a chip, I havnt tried one, I dont Think its worth the money if all of a sudden you have to buy premium gas and only for a few hp.
-Go on ebay and buy a "e30 K&N Filter" and it will come with a adapter plate. Buy it from the guy called Million products
-And lastly a good suspension setup will REALLY make these things kick in the corners. IS's come with bilsteins but the Is dont. Go find some bilstein sport setup, i dont really know much about suspension but someone else does on the forums

3. Aftermarket shifters - screw'em. One of 2 things. short or really short.
-If you want short, Go to the BMW dealer and get a z4 2.5L shift lever
-If you want Really short get the z4 3.5L shift lever. However this is a longer install time because you have to modify 1 other part to make it work correctly. If you want further details i can give them to you.
-Youll also need a new nylon cup bearing for the shifter, a few circlips because youll probly loose the ones on there, and some of the small yellow shifter washers. They will know/be able to find the part numbers for these, total shouldnt be above 70 for the entire thing.
 

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The "IS" exhaust isnt any different from the non "IS" exhaust. Dont go with an aftermarket cone filter unless you add a heat shield or you'll lose power. (www.lukasbmw.com builds a very reputable heat shield).

Chips are the best bang for the buck horsepower youll get. The Jim Conforti adds 15hp. Only drawback is that you have to run premium instead of plus gasoline.

Overall, for horsepower mods get a chip and a 4.10 diff. Youll be able to walk away from E30 M3's.

And I believe Fox means the Z4 3.0 shifter, not the 3.5...
 

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Huh? I has merged exhaust piping while IS has dual exhaust piping. Also the IS head is different, with better rocker retainers and whatnot.
 

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Originally posted by Fox@Dec 27 2003, 08:53 AM
Huh? I has merged exhaust piping while IS has dual exhaust piping. Also the IS head is different, with better rocker retainers and whatnot.
The "IS" drivetrain is identical with exception to the rear differential which comes standard as a limited slip unit on "IS" models (except the 318is, where is was optional).

The exhaust is dual on all M20B25's. The ETA does have single piping though.
 
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