Hi there. I recently purchased these headers and was wondering what Flowtech header back exhaust kit would be most appropriate and add the best performance: https://www.holley.com/products/exha...parts/32542FLT

Also, the instructions say the email me header to head flange should be cut 3/4 of the way through for shipping, and to complete that cut before installing to allow the header to be easily installed around the engine mount. I don’t see that these headers have been precut. Do I just pick a point in the middle and cut them? Any concern with cutting through the ceramic coating. Thanks for any and all advice!