Howdy.
I had Berk HFCs installed about a month back (there is a thread in here somewhere that I posted w/ dyno results). I also have that hiss and ping noise under hard acceleration. Sounds totally normal all other times.
I was worried that I had an exhaust leak from one of the joints with the HFCs and took it back to my local shop. They put it back up in the air, and checked all the joints for signs of leaks and checked the torque on everything from the oxygen sensors to the bracing. Everything was tight and there was no sign on a exhaust leak. He also examined the HFCs (as best he could while they were installed) for signs of broken or loose honeycomb. Everything checked out okay.
Finally, we took the car out for another test drive, this time with the data reader hooked up. Everything looked fine; no problem codes, no timing being pulled, nothing. Just that same sound anytime you flog it.
I'm still love to know what is making that sound and get rid of it if I could, but at least everything seems to be working fine. If you have any more luck then I, please post it here or send me a PM.
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