From my point of view, I think you did great...

Since I heard those kreissieg sounds, in the modena, murci, m3 and gt3 it just camed to my mind that there is no better racing sound quality than those exhausts.....

10k bucks is very expensive, but in my opinion its worth it!!!!!

It will sound really like an F1 engine, so I hope you post some videos after the installation

I think that for a ferrari I will install kreissieg and not capristo or tubi....and for porsche I'll go for that titanium exhaust system from the brand i.mec japan or something.....that sound of the best motoring video between the 996gt3mk2 with those exhausts and the f430 was awesome....