Hey man welcome to the board.Ill do my best to answer all of your questions here.
1.The 91 and 93 suspension have very very minimal differences. On the road youll notice the 91 is a little more tailhappy than the 93 but thats about it. Youll want to upgrade the suspension on either car anyways so that doesnt really matter. A set of performance springs will run you $300 and up while coilovers start at around $1600 for a set.
2. 91 and 93 engines are the exact same in north america. No differences in turbo. The jdm mr2s had the ceramic turbo however personally i think theyre junk. There isnt really a difference in power potential and the ceramic wheel has been known to break apart and go into the engines causing huge damage.
3. LSD for MR2's are one thing for the car that is affordable other than the install. Ive seen used oem ones gor for as low as 150 while aftermarket units are around 1000
4.300hp or 300whp? 300hp is easy. downpipe, exhaust, intake something to control fuel and boost and youre there
5. Prices of MR2's have gone down huge in the states. The deal is even sweeter with out strong Cnd dollar. Keep in mind it is a 13 year old car so the prices are bound to drop. In canada they seem to stay the same price thoug.
Hope this all helps
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