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Well my car is sitting with a blow rear this winter and i'm saving up to put a 12 bolt in it for spring. I was just wondering what kind of improvement should I expect with a 12 bolt and slicks over a 10 bolt on street tires. My best run was 12.84 @ 110 with a 2.06 60 ft. Also i'm thinking about maybe putting a cam in it as well and just wondering what all i need to buy to go with the cam. My car is roughly has around 45 - 50k miles. Thanks.
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02 Black Z28 A4
SLP Air Lid, K&N Air Filter, SLP Loudmouth,Free Ram Air and Thottle Body Bypass, Pacesetter Longtubes & Off Road Y Pipe, Transpak, MSD Wires, FTRA, 3.73s, Subframe Connectors, Strut Tower Bar.

96 Chevy Beretta 3.1(For Sale); 78 Chevy Scottsdale 5.7 (9 inches of lift with 36s(For Sale)); 02 Silverado Z71 5.3(Stock, but not for long)

When adding a 12 bolt or 9" your adding static weight and rotating weight. You will also need to upgrade the DS to either a 3" steel or 3.5" alumnium, which btw are similar weight.

Your going to loose about 8-12 hp off the top and with the extra weight you will go slower if you dont improve on the 60 foot.

Dont get discouraged, this is enabling you to have a rear that will survive a 5k cluch dump.

Adding a converter will help, with a set of sticky tires is a must.

Adding a cam will improve the car as well, one of the best mods to do.

if you do a cam you need.....

Valve springs
Pushrods
Cam
Gasket
Fluids
Tune

You should also do a

Underdrive pulley
THrottle body
Suspension work
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2002 Navy Blue Metallic Trans-Am, 6 Speed, Leather, T-tops. SLP Flow Pack, M/T Street Radials, Free Mods, otherwise stock. Moser 12-bolt and BMR Suspension

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Posted By: rnrkid On: 12-05-2007 @ 08:15:32     Reply | Top | Edit

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12 bolt = little gain
cam = very noticable gain
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2000 WS6 M6, Volant Cold Air, SLP Y-pipe and LM cat back, SLP subframe connectors, BMR panhard relocator,UMI LCA, UMI Adj. upper and lower a-arms, B&G lowering springs, Spohn torque arm, ported and polished throttle body, 12 bolt Moser w/3.73's, cross-drilled vented rotors.
http://www.cardomain.com/ride/2355847

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