went the quieter system with Hurricane 1 7/8th headers, 100 cell cats, 3" system. It will be installed in 2 weeks with a harrop cold air box and pod, thermostat, KPM 1000cc injectors, top pulley and tune. hope to see high 300 early 400's rear wheel kw's. maybe?
Should put a smile on your face, just bear in mind sometimes takes a few kms on a new exhaust for it to bed in and sound its best from carbon build up. Your manta should have zero drone
yeah mate I had a manta on my previous GT and it sounded mint, nice and grumbly. I will whack a cam, a linginfelter balancer, bottom pulley and some Higgins heads on it next and that will pretty well do it for me.
Fully speced out with PAC springs and Mast Stainless valves TI retainers and Yella Terra Mast Roller Rockers your looking at 6k for the Mast Mid Bore LS3 heads. You have to get longer pushrods as well as the decks are taller. Pushrods are around 8.25inch.