ADS superchip
 

I read where this chip added 38hp to an 89 auto. Is this for real? What exactly do these chips do to enhance performance. Also, I see on their website where they have different chips for different years. Would a chip for 90-91 5spd(part #9075A) work for me? It says I need part #8975A. Just wondering because I found a used one and was curious if it would work in my car, would it do any good, and how much is it worth?

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'89 LX 5spd w/ 56K, MAC shorties & H-pipe, Flowmasters, 3.73 gears, Moroso cold air