Does anyone have experience with arrow titanium competition exhaust systems? How do they compare to Akrapovic in quality and performance? I ask because arrow is the only brand in stock at revzilla.com and I can get a titanium header with the titanium shorty. I am worried though because the web site says that you "Can not install this exhaust on an engine without a tune." This is "because the stock engine just can't keep up". Is this just hyperbole used for marketing or is it true? I don't know anyone nearby that can tune my stuff and I don't know if I really know if I can spend the money on a tune right away. Should I just wait and save up for an Akrapovic when it comes in stock and save up for a tune at the same time? For reference here is the exhaust system I wall looking at Arrow Competition Low Exhaust System BMW S1000RR 2020-2022 | 10% ($203.40) Off! - RevZilla.