[JRSully]

I have the Pypes cross flow (Race Pro muffler)header back set up on my 70 L78 Nova. At idle, and very sedate crusing, it is a very reasonable noise level, as Marlon stated,no resonance inside the car but when you jump on it, holy sh... it gets LOUD,almost like a full length straight thru exhaust system.I personally love the sound. IMO a very good compromise, good quality components too. I had a few inital fitment issues (turned out being a slightly bent header) and was near the Pypes facility, they told me to stop by, they put the car on a lift and had a tech re-do/and weld the entire system on the cuff.! very nice people to deal with.