[ItBites]

I use the Dynomax bullets with the 3" ID on my 540 cid that makes 540 rwhp. They are not any louder than the other BB cobras in Phoenix, until I pass 4000 rpm, then it just screams. I had a high compression (12.75:1) engine before; it was louder at idle - crackled... This new engine is 10.5:1 and runs on pump gas and the sound is more mellow. The exhaust sound level is not just a function of the muffler, but also compression and cam overlap.