Exhaust Question

#21

Bruce - 2" pipes would be a "replacement" of the stock 1.75" pipes which still retain the same dual pipe configuration. I would take it that they would be legal. Also, Carter has already commented that dual glasspacks are kosher (even though they technically should not be based on a strict reading of the rules).

And Matt - I don’t see how "a stock muffler with holes" in it would not qualify as a replacement of the stock muffler. But then again it does say the the components may be replaced, but does not say they can be modified, and technically you would be modifying a stock part… or are you replacing a stock part…

I’m planning on going with the system I described above (dual 2" pipes feeding to a Y-pipe attached to a single-inlet / dual-outlet Flowmaster). If anyone wants to protest the Y pipe I’ll race GTS! :cheer:

#22

9.3.4 says any part of the exhaust may be replaced as long as it retains stock configuration. Couldn’t be anymore clear.

Two pipes stock = two pipes replacement.
Stock mufler = glass packs.

No one could dispute or question that? If there are questions just ask and anyone will tell you what most people run.

#23

the legality question arose because the word "replaced" is specifically defined in the rules. The earlier comment was that the definition of "modified" would be more appropriate for what people are doing.

Somebody did ask for a clarification on legality earlier in this thread. I don’t think "what most people run" defines legality.
cheers,
bruce

brain wrote:

[quote]9.3.4 says any part of the exhaust may be replaced as long as it retains stock configuration. Couldn’t be anymore clear.

Two pipes stock = two pipes replacement.
Stock mufler = glass packs.

No one could dispute or question that? If there are questions just ask and anyone will tell you what most people run.[/quote]

Post edited by: leggwork, at: 2005/11/18 18:27

#24

It’s good to see a discussion about these things, and we encourage anyone to bring up any subject.

As we mentioned earlier, we wrote the Rules knowing that someone would see things we missed, or should have clarified better.

Bruce is correct. Just because cars have been built a certain way, they are not absolutely legal. However, we want to keep the costs down and the cars are very close in performance. So, we will make a few minor wording changes (just like we did last year) so that this subject is crystal clear.

With that said, the current racers will not be told to change their exhaust systems, unless one is seen to be well beyond what is written.

This winter, Mike and I will go throught the Rules, line-by-line, to make a few wording changes based on what the group has brought to our attention, and considering the cars that have been on track, beacuse the formula is working so well.

The current drivers should know that we will only make small wording changes and will not make major changes for the '06 season.

Carter

ps. A stock muffler with holes in it is legal.

#25

Actually, after re-reading the definition of "replaced" and "modified," I think the wording of their definitions should be cleaned up. It seems that "replaced" should also include "welding, and machining." "Modified" should just add the option of removal of the item. Basically since most of you cut off the stock exhaust right before the cat and welded in pipes and mufflers and that violates the "replacement" definition since welding and machining/cutting were involved.