They work great, have welded some coils on them and gave my Titan 04 a nice deep tone. The only downside I see with this product is the need to remove the headers. Unless you have a welder to heat one side of each nut on the mounting bolts this can be a real problem and you risk removing the nuts. This probe can also be a real pain. If your OEM gaskets are still good, you can reuse them and save time re-tightening the nuts since they're already broken. I would still check them to be sure.