Hello everyone, I’m new to the forum and have not found any answers with the search function yet. Have already read a lot for the CTR but that doesn’t fit on my ATR. Therefore I ask directly to everyone. Drive an ATR 99 and want to install a clever exhaust with 200 Zeller Kat. Performance and sound are IMPORTANT. Where can I find and what costs?? I want to know further what possibilities I still have to get a few more PS from my Honda. ( lufi, camshaft, Apexi, Chip, ….) Should also be taken into account for engine durability. PS: Should be legal, so with TÜV. PS2: No turbo and compressor rebuilt. Thank you already in advance MFG Mars