So I put some miles on it and now I was wondering a few things:
1. I heard that when using a high level type exhaust on the 401/390 engine it can cause hot spots which can result in premature failure or wear or engine damage.
- I am wondering if this effect is when running decat & removed resonator pre-muffler too (I see alot of people with cat/premuffler delete and slipon), or only to high level types without a cat.
-perhaps the GPR version with a euro 4 cat and a stock air filter would not have such issues?
The reason I ask, is because I have typically used the High Level with the euro 4 cat it came with and stock paper filter... when using a different cat, or no cat, or a filter lid, it doesnt feel "right". And this effect I noticed especially with the BMC filter, if feels very powerful, but very rough...and very loud.
Anyone with experiance with incomplete filling and hot spots??