Ok for starters I have 2001 2jz-ge gs300 with 210k miles. The car was running perfect till about 2 weeks ago. I've had a muffler delete on the car for quite some time now and never experienced and unusual noise other than that sexy 2jz. But in the recent days I believe an exhaust leak opened on my downpipe where the exhaust connects to the 3rd and last catalytic converter to be specific. My issue is a loud hissing noise everytime the rpms pass 1.5k and the engine feels extremely sluggish on acceleration. If I had to say the 0-60 time is now atleast 15 seconds where as it should be 7-8 seconds. It has a hard time keeping up with fast moving traffic from a stopped position. I did order a new downpipe hoping it will fix the issue. But Im not 100% why the car is having so much hesitation on acceleration. Thanks for your help!
