blkmkiii

iTrader: (2)

Above it the TT rules for exhaust

Non-BTM or modified resonator(s) or muffler(s) only (no exhaust piping modifications)+1 point

So if I wanted to delete the rear muffler and resonator but keep the stock exhaust sizing with the factor cat this would be acceptable?

Seefo

iTrader: (5)

I asked Greg a similar question a few years back. Basically his answer was "probably not".

I took that to mean that such a mod would be taken as a red flag that you maybe outside the rules and will be inspected thoroughly. Better to ask him yourself though.

speedengineer

Probably yes, but grey area. :( Exhaust points rules were rewritten this year in an attempt to make it easier. In the past, people would for example take 2 points to replace a short stock header with a long tube header that also replaced a section of stock exhaust piping, and it was confusing if they also needed to take additional points for the piping. Same confusion with cat deletes, etc.

It's easier now, assuming you take the full 5 points or even the 3 point exhaust options, as then piping modifications are allowed. However, it's still confusing if you try to take just the 1 point for just the muffler/resonators. For example, our stock mufflers bolt on with a flange, but there is also a short piece of piping between the flange and the muffler, and also the tailpipe. Do we have to take the two extra points if we just unbolt the muffler at the flange? Technically per the rules wording, yes, it's just that a competitor would have to be a total jerk to protest for that. We'd otherwise have to cut open the stock muffler, modify the internals to be low restriction, then reassemble - thus still utilizing the stock inlet and tailpipe piping sections. Ugh.

I'd just email Greg if I were you. Let us know what you find out!

Rules for reference: