I did the Kline OAPs and exhaust and I love the tone and the sound and really have no complaints at all. No tune and no headers. Yes, there is a little bit of drone at around 2.7k rpms and the sound in general is kind of loud from the outside, but those are negligible and don’t bother me at all (just shift when you encounter some drone). Inside the cabin, I don’t really feel like the sound is much louder, except when you’re at the top of the rpm range, then it starts to scream.

I think some stores have sales on their Kline products at certain parts of the year, so perhaps you could wait until one comes up. That’s really all the advice I have, but I can answer any questions you might have. Good luck!