He is completely full of shit. Any car equipped with an OBD II needs a fuel cut defenser. My car is a 96', and I have one. The instant it sees positive manifold pressure, a check engine light will come on and it'll be like you ran over 7200rpm in 1st gear.

91 awd: 60-1, 880's, E-Prom, etc.
93 awd: JDM 6 bolt, K&N, full exhaust, Wally 255, otherwise stock.

R.I.P. the original "Factory Freak"
15.5's with short ram and catback only
1996 RS 5-speed