Like someone said earlier, if you're going to tinker with more than intake/exhaust and wheels/tires/suspension (boost, swaps, tranny work, internals), you'll end up in a much different class for autoX.
Regarding Hondas, you'll get the best time gains from things that affect handling not power, and still stay on the cheap side. The motors are bulletproof, 100k is just breaking it in! Finding a stock motor in the car is tougher though.
The GS-R is worth way more bc of the vtec motor. It's a-whole-nother beast in straight lines, power production potential and on high speed tracks, but for autoX the ++'s over non-vtec motors (LS/RS...) is limited b/c there's not much rev range (5-8k). Any handling ++'s over non-vtec models matter little bc all parts are interchangeable.
Bc it's lightweight and small, $2500-$3k in quality parts will make any Honda crazy faster than stock around a track.
Good coilovers: $800-1200 new
22-24mm Rear sway and subframe brace w/ bushings: $300 used
205's on 15's or 16's: $800-1000 new
Front pads: $100 new
I/H/E: $400-500 used
Tower strut: Stock
Bulletproof short geared tranny: Stock
Bulletproof motor: Stock
Get advanced with an LSD, corner balancing, dedicated tires, stripped interior, and a supercharger and there isn't much that can keep up with it.
Sounds like you found some decent Integras, but the prices are about $1k high on what you could find for a barely modded one. I hear ya on FWD, you're limited by physics on power you put down in corners and it can get a little frustrating for some.
A little deeper reading on the Integra if you desire
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