Instead of mufflers look into the SLP resonators. You cant get louder than that, trust me....
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i have a 16" bullet exhaust. i dont have the low rumble in the cab but outside i have it. and at around 1800 rpm is where i can set off car alarms as i drive by. i love doin it crusin around the city. only problem is that i live in San Diego. Ca smog sux! u have to have ur cats no header no this no that. BLAH BLAH BLAH!!! had to get new manifold... not headers. had to keep the cats. idc im goin to stright pipe it just for sh*ts and giggles. but i like my muffler. and in tunnels at around 3500-4000 rpm i sound like a nascar car. i should record it one day. ive had someone ask me if i herd that noice in the tunnel. it sounded like a "nascar" that he couldnt see. i said u mean this and i reved. then took off. yes our trucks rnt the fasted with the low horse, but the torque is enough and we can kill chevys all day with their louder exhaust notes, dodges i have trouble with.