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sounds strange, but I've seen 12.7's 12.8's from a full exhaust (no cat). the engine internals were a bit of a lucky dip tho. might of been a good one.
in regards to your 3 or 4 wheel spin launches, again, must of got a good one. the other 99% of them gti-r gearbox's just dont last
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Oh yeah pretty stock was front mount and exhaust dropped from stock down pipe at the cat. No boost controller though.
3/4 wheels spinning was due to 195's and the goat track that is the townsville drag strip. Any car will get wheelspin on that strip! Driving through the water on the burnout pad also helped keep the wheels spinning and the revs up.
Oh yeah i just remembered I had a vid on my webspace, how not to launch a car gently (the gtir in question, gt4 in the other lane).
http://users.tpg.com.au/timw83//gtirandGT4-SV302344.AVI