Exhaust is not that loud, at least to me. Can hardly tell it is running at idle. It will easily pass national sound regs for autocross, as the same setup was below 90db on my ST Civic. Limit is 100. Would be annoying on the street, though, as it has the usual drone at 3000. I'll fab up an out-the-back extension for off-season daily use. I will say that it sounds amazing from 4000 and up.
As for weight, the header is 18 gauge 304 stainless so it ends up being a couple lbs lighter than the OE catted manifold. Total system weight with the spun cat is a couple lbs less than the previous system (OE manifold->2.25" downpipe->Burns->dump).
Collector outlet is 2", transition to 2.25 happens at the exit of the cat. Would have used 2" all through, but we already had the muffler.
As for availability and cost, Andris will make more if people really want them, but it will be very expensive. This project was done for a GRM article to promote
Burns' X-Design parametric header design process with third-party fabrication. So there were some deals made...but it still cost me a pretty penny. Laivins is a first-class race car fab shop, and you pay for that level of expertice.
FYI, that muffler was a leftover from the GRM test we did
here.
Also wanted to give a shout-out to Mike Allen at
Mazda Motorsports who worked through the Mazda heirarchy to get us cam specs for the 2, which is a key ingredient to the X-Design process.
