There’s a lot that has been done to the engine and I’m not the one who has built it. But, a build log should be somewhere and if I find it, I will give it to you (will try my best to get it) :) Thank you for your support and interest!

No, the car runs very well and it isn’t knocking. The car has ”two exhausts”(don’t really know what it is called), and the shorter one opens when pulling hard. It is a 5 cylinder and when running a short exhaust, they sound kinda strange. Search T5 Volvo sound and look at more clips and then you will find that this is how they sound (more or less). Thanks for your question!