Hey fella's,

I had a set of 4-2-1 stainless headers sitting around for a few months, and finally got them installed last friday, along with a 2 inch cat-back system the week before on my EK1 Civic (D16Y4).

About half an hour of driving around after the header install, I heard a massive metal on metal ting and limped the car home in fear of the worse. Got it up on the jacks on the weekend and discovered a bolt missing from where the cat connects to the backpipe, and also found a missing nut from the stud the header connects to. Sure enough, went back to the shop that did it today, and apart from finding 3 leaks from a dodgy weld job done by the ****wit apprentice that worked on my car, they replaced the missing bolt and replaced the all the head nuts with washers and welded up the leaks.

Again, I took the car out for a blast afterwards and within the hour, heard another ting , pulled over and found another head nut and washer missing.

What's the go from here? Apparently the holes in the header are larger than the studs them selves, leaving room for movement, which would explain the loosening of nuts, but is there any way to ensure they're not going to come off mid-drive again? I'll be heading back tomorrow to see what's the go, and hopefully the bloke (who's been nothing but nice) can fix the problem. Seriously considering taking it somewhere else for a second opinion.

Any others had the same problem? Any input would be appreciated!