Non-BTM or modified resonator(s) or muffler(s) only (no exhaust piping modifications) - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 06-17-2015, 01:05 PM   #1
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Mar 2011
Posts: 273
Total Cats: -163
Default Non-BTM or modified resonator(s) or muffler(s) only (no exhaust piping modifications)

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?
blkmkiii is offline   Reply With Quote
Old 06-17-2015, 02:16 PM   #2
Elite Member
iTrader: (5)
 
Join Date: Dec 2010
Location: Raleigh, NC
Posts: 1,970
Total Cats: 49
Default

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.
Seefo is offline   Reply With Quote
Old 06-18-2015, 05:40 PM   #3
Junior Member
 
Join Date: Dec 2012
Posts: 67
Total Cats: 2
Default

Quote:
Originally Posted by blkmkiii View Post
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?
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:
Code:
22)22) Modification,porting, or replacement of the BMT exhaust manifold or header(s) (includes any/all other exhaust and catalytic converter modifications) +5
23) Any modification to the BTM exhaust piping and/or catalytic converter (includes muffler modification or replacement) +3
24) Non-BTM or modified resonator(s) or muffler(s) only (no exhaust piping modifications) +1
speedengineer is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
1996 Turbo Build Goldwar DIY Turbo Discussion 2 09-29-2015 10:20 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:37 AM.