Hi all! Im not a newbie when it comes to miatas but am def a newbie when it comes to custom tuning. I recently purchased a 97 miata with a full FMII turbo system. It's working perfectly but I have one small problem with it, the exhaust is a little too quiet. It's a full 2.5" magna flow system with a hi-flow FM cat. It has a large rear magna flow muffler. When I had my mazdaspeed I replaced with rear muffler with an enthuza one that has an anza straight through glasspack and I loved the sound.

My question is, if I have enthuza make me something similar and I just replace the muffler, will that require the hydra to be re-tuned? The current tune was done by Ken Hill at oracle so I'm obviously not in a huge rush to start mucking about with the maps if it can be helped.

Thanks!