Silencer Supertrapp

I would like to buy 2 pcs but not sure wich tye to order.
Any guys out there having placed them and what type would you recommend?

Engine SB302 Approx 380 HP
exhaust pipes : 2 with each 3' diameter.(Dont have the space dimension between both pipes but if important can go out and measure this one).

Tx
Fred
 
Fred, I tried the supertrapps sourced from Demontweaks. With 6 disc the car was quieter but at higher revs above 5000rpm the engine struggled to breathe and the oil temperature increased significantly. My engine is also ford 302 producing 400hp. So I decided not to use them and avoid those events which impose noise restriction of 100db and below. However I did notice that there was markedly more torque lower down in the rev range.
 
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