K&N Drop ins and an Axleback will yeild almost identical results to G3's and an overpriced cat back if thats all you are planning to do.
I don't see what the issue is with going to HFC's. Thats about the best bang for the buck on these cars.
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2011 370Z, 6-Speed Manual, Sport Package. - K&N Drop ins | Top Speed Axleback | H&R Spacers SOLD
2009 G8 GT, 6.0L LSX V8, Rotofab Intake, ARH Long tubes, SOLO exhaust, VMS Tune - SOLD
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