Resonated Test Pipes sound bad with stock exhaust

amansker

So this past weekend I installed a set of Beluga Resonated Test Pipes on my Z. I had purchased Berk HFCs off a member on here, however USPS lost my package and after 4 weeks of trying to deal with them I finally gave up and decided to just buy these even though I knew they were a cheaper brand. My friends told me with the exception of ART pipes, most resonated test pipes will sound the same.

My plan was to keep the test pipes paired with the stock exhaust with the exception of the Top-Speed Y-Pipe I had bought for my Z a long time ago but never installed. Installation went well, after spraying PB Blaster on the demon bolts 3 days straight before the install they came off without much hassle.

However, after the install my car is way too loud for my taste and sounds horrible. Under 3k it doesn't sound that bad with light throttle, but any half to full throttle acceleration makes a blaring sound after 3k rpm like a Civic taking off. I thought installing the resonated pipes would give it a deeper sound with less rasp. There is hiss when decelerating from about 2.7k to 2k rpm but after reading on this forum I found out this was common for our motors.

Any ideas on what I should do to tone the sound down? Is the y-pipe causing this? Will installing a resonated catback help or should I just take off test pipes and just money on another set of high flow cats? I also thought of just going down to my local exhaust shop and see if they could add another resonator somewhere to help quiet the exhaust down.

Any advice is appreciated, thank you.