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I would definitely choose the test pipes over x pipes for a few reasons
1) Fitment is not an issue, clearance is not an issue etc.....everything is spot on with zero leaks or issues. This was NOT the case with a full x pipe setup prior
2) It makes more power than an x pipe with HFC, I have substantial seat time in both. Very noticeable torque and power gains
3) It sounds better and cleaner when combined with the stock x pipe (unless you like really loud exhausts). Combined with a dinan muffler, the car sounds awesome and has only a very very tiny amount of drone at 2k-2.2k rpm that can only be heard when on the gas and the windows are down.
4) Price is much less than other x pipes
Bottom line, I love the turner test pipes. Yes, you will need a tune should you decide to run these to account for the SES light. Contact ESS for this.
No, you will not pass an OBD-II based test with this or any other x pipe (unless you get lucky and the o2 extenders actually work, they didnt for me).
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