So little backstory. Back in dec2022 opprutunity popped up to get an 03 coupe with old school stillen supercharger. 113kmiles overall car is extremely clean. Interior is exceptional. Carhad one noise which was passenger front hub bearing. Bought it on the way home and replaced it right away. Drove for 4 daysand supercharger started making bearingnoises so sent that out and 6 months later supercharger is brand new. Now to get to my point. Car was straight piped when i bought it. Bought an isr 3inch single exit and isry pipe. Car ran fine with new supercharger and no exhaust just headers and test pipes. As soon as i installed exhaust and starteed it up and let warm up immediatly started hearing what i think might be rod knock. Can attach videos later. But if anyone needs more info aplease let meknow. Need help with this

 

Definitely need video here. But make sure your gasket isn’t blown out there at y pipe.

 

so first video is right after I got the supercharger back and reinstalled it was just dumping right out the test pipes. Sounds fine no issues just stupid loud. Second video is after installing the use 3” single exit and use y-pipe. Started it up and let it warm up and started hearing that. Didn’t rev or nothing just sat at idle after about 2 minutes started hearing this. Decided to completely disengage the supercharger to make sure it wasnt a supercharger bearing issue. That’s why the belt is off. Completely baffled at this it only started after hooking up exhaust. Overall car is good. Has injector dynamics 1050cc injectors. Uprev maf sensor. R35 coil packs. Ecu is tuned but not sure how well. Literally bought this car in December and have only been able to drive it a week so far. Please help.

 

I can’t for sure diagnose that over the video, but I’m hoping that’s just a bad main tensioner and not a rod knock. Waiting for others to chime in. Bad hydraulic tensioners usually are because the galley gaskets have gone bad and oil pressure is low.

 

oil pressure is good have a gauge and stays steady at 43 at idle

 

So update. Pulled all the belts of to make sure it wasnt any kind of pulley noise. No luck there so decicded to pull lower oil pan and low and behold it was nice and glittery as well as some nice size pieces of metal. Gonna pull the upper oil pan off tomorrow to see if i can get a look at crank and rod bearing but its looking like a full rebuild is gonna be happening. Most likely gonna go with a lower compression ratio and forged internals to go with thesupercharger for now and to eventually go twin turbo