It's pops just before boost comes in I'm pretty sure it's due to improper spark plug gaping and it's not the Intake sucking in air it's a boost leak for sure I had it all apart a few day ago and I couldn't find a boost leak on the entire exhaust side, I'm going to take the whole kit off and leak...
My 2007 mcxpress turbo apex 290hp kit is making a strange whining noise from the turbo, as a result I'm experiencing a larger pop from the bottom end as well as an increase in turbo lag. It's sounds a lot like a supercharger whine. Could it be because of and issues with the boost altitude...