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Simple, your friend has a pretty powerful engine in a light car. Put your engine in a civic and VTEC will feel more powerful.
Is your friend's VAFC dyno tuned? If not it's not doing jack but displaying some information. I properly tuned VAFC can add some good numbers across the powerband. The thing is you don't have enough done to your engine to warrent the need for dynotuning a VAFC yet. I would say get some more mods first, like an intake next.
And unless your friend has changed the crank pulley I doubt those are doing much. Of course if he did change that he's putting increased stress on the bearings due to the aftermarket pulley not being equipped with a harmonic dampner. So he's killing he's engines life.
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2000 Honda Prelude
Mod list-
AEM CAI, AEM underdrive pullies, AEM FPR w/fuel rail, AEM brake pads, Apex'i N1 catback exhaust, Random Tech Hi-flow cat, Autometer fuel pressure & A/F ratio gauges, Apex'i VAFC(dyno tuned), ACT Xtreme pressure plate w/street disc and streetlite flywheel, Zex wet shot w/dual bottles and purge, Neuspeed front strut bar, VIS EVO CF hood, Honda Access door sills, NX bottle warmers, Lean Racing short shifter
Soon to come-
17" wheels, ES motor mount inserts
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