1998 GTS upgrades

Skolnick89

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Feb 10, 2018
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Springfield NJ
I purchased 1998 GTS in showroom condition but no info on mods.

Car has headers, no cats, no muffler just resonator. Smooth tubes and upgraded air filter.

How can I determine if ECU was altered for mods?

Car has big break upgrade. I believe gen 3/4 brakes upfront and gen 2 front brakes on rear. Also Car lowered with Eibach springs. Think stock shocks. Ground clearance about 3”

Purchased 3:55 rear but not installed yet
 

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