my 98 hasen`t been formally run in the 1/4 but rough tests on the road lean towards about 13.7@100mph. here are my mods:
ATI procharger 11psi 2 core intercooler
Harland Sharpe 1.8 non adj roller rockers
2.5 inch hooker dual exhaust kit Part #16864 with
flowmaster 40`s
Denso IT-20 iridium plugs
MSD 8.5 superconductor wires
3.73 with trak-lok
B&M shift kit on the 4R70W
226rwhp 267rwtorque with slipping tranny
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mods that i have but not installed yet:
42lb injectors
Pro-M 3inch UNIVER mass air flow meter calibrated for 42lb inj
Pro-M chip
MAC off road h pipe with random technology super hi flow cats welded in
pro-built transmissions 4R70W upgrade and super rebuild kit
ported 98 heads Flowing 288cfm intake and 223cfm exhaust @.500 lift
homemade custom EFI spyder intake (from a reworked 2bbl 3.8 manifold)
estimated rwhp once done: 320rwhp (i hope)