Spec Twin?

[Shark_Bait88]

Originally Posted by Twinz

What would be the point, sound?

Yep. The car is very quiet stock, IMO, and I like to be able to hear where it is in the RPM range. Also, VROOM VROOM noises make me happy.

Most catbacks offer a few pounds of weight loss at best, some are closer to ~10lbs, and then things like muffler deletes are ~20lbs off the rear. Power gains are minimal to non-existent (if the butt dyno reads them, it's in your head).

So I'd say that adding an exhaust on these cars is really only ever done for the sake of noise, ocassionally as a means of weigh reduction.

Edit: Also mostly done for aesthetic purposes. Bigger tips, single exit, titanium/burnt look, etc. I think 90% of the reason to change the exhaust on these cars is for sound/looks. The other 10% is a split between weight and better exhaust flow. (These are not real figures. I pulled them out of my tailpipe to illustrate a point )

[cjd]

Originally Posted by iLuveKetchup

Pardon my ignorance but are extended wheel studs allowed in SSC? I've already broken 3 wheel studs and looking to replace with ARP. I just bought the car used and the previous owner must have over torqued the lug nuts.

Wheel spacers allowed too?

You can get stock length ARP studs.

[strat61caster]

Originally Posted by cjd

You can get stock length ARP studs.

Those came out a bit too late for some of us

[cjd]

Originally Posted by strat61caster

Those came out a bit too late for some of us

Hah. I'm running extended up front but plan stock length rear for easy install... Need to clear the brakes with the spare and that takes 20mm+... I'm being lazy, over 60 wheel changes and no problems. Doesn't see salt and gets an awful lot of wheel swaps over mile driven, both probably help. I carry tools and replacements though...

Then again, I'm not running SSC...

[Twinz]

Originally Posted by Shark_Bait88

Most catbacks offer a few pounds of weight loss at best, some are closer to ~10lbs, and then things like muffler deletes are ~20lbs off the rear. Power gains are minimal to non-existent (if the butt dyno reads them, it's in your head).

I don't think SSC-legal cat backs will offer much in the way of weight savings or exhaust flow/hp.

[Shark_Bait88]

Originally Posted by Twinz

I don't think SSC-legal cat backs will offer much in the way of weight savings or exhaust flow/hp.

My point is that no catback exhaust for these cars really does any of that. Some offer weight savings, almost none offer any increase in flow/hp. The majority of restriction on these cars occurs in the header and FP.

I think the major reason for the exhaust rules is weigh restriction, while also maintaining tolerable noise output.

FYI, updated rules were posted this morning. Offset range is back to +40 to +48.

I've got some loose TPMS at home that I need to weight...

[Twinz]

The 40mm offset should make the camber bolts useful (and make our tires last longer). I am so glad they fixed that and stuck with the original rule.

*edit* re: exhaust rules....I think they are trying to make sure big spenders don't gain an advantage, but a simple steel/resonator rule would keep things cheap and quiet. (Just one and straight through allowed if it meets db restrictions)

The wheel alignment thing was far more important to me. The ability to get some camber will make more of a difference than being stuck with my stock exhaust.

[Jshreiner]

yes the camber is far more important and that's good that it changed have to 40.

My only problem with the exhaust rule is that I bought my car with the invidia n1 and did not get a stock exhaust so it just adds another part I have to buy or hope someone is willing to trade.

[Shark_Bait88]

Originally Posted by Jshreiner

yes the camber is far more important and that's good that it changed have to 40.

My only problem with the exhaust rule is that I bought my car with the invidia n1 and did not get a stock exhaust so it just adds another part I have to buy or hope someone is willing to trade.

Lots of FR-S/BRZ owners want the N1, I'll never understand why because it sounds like garbage. But I don't think you should have much trouble selling or trading it.

[Locust]

Originally Posted by Twinz

*edit* re: exhaust rules....I think they are trying to make sure big spenders don't gain an advantage, but a simple steel/resonator rule would keep things cheap and quiet. (Just one and straight through allowed if it meets db restrictions)

Well the interesting thing regarding exhaust is you can go get an STM race exhaust for $700 and it weighs 30lbs less than stock and flows better. So it's not like there weren't cheap options.

I've decided I'm sticking to D-Street next year after they posted the exhaust rules. That pretty much solidified the decision for me not to spend more money on yet another class switch.

[Cueman]

Originally Posted by Locust

Well the interesting thing regarding exhaust is you can go get an STM race exhaust for $700 and it weighs 30lbs less than stock and flows better. So it's not like there weren't cheap options.

I've decided I'm sticking to D-Street next year after they posted the exhaust rules. That pretty much solidified the decision for me not to spend more money on yet another class switch.

+1... although I really WANT to move.

[Jshreiner]

Originally Posted by Shark_Bait88

Lots of FR-S/BRZ owners want the N1, I'll never understand why because it sounds like garbage. But I don't think you should have much trouble selling or trading it.

Well that's good to know. Still sucks to be at the point to where I am selling everything I bought earlier this year. At this point I am weighing the cost of parts to how much seat time I could get for less.

[snoxracer183]

What would lead you to believe that a straight through - perforated core muffler would not be legal? This type of muffler meets any definition of baffled I've ever run across.

[Twinz]

Just the first thing that popped up from the Google machine (and it is in line with what I always thought a baffled muffler was):

https://www.quora.com/How-do-baffles...-of-an-exhaust

"Baffles reduce the amount of sound produced by the exhaust most commonly on an internal combustion engine by forcing the exhaust flow to take an indirect route before exiting the muffler."

Your picture looks like what I always thought a straight-through muffler/resonator was.

I have yet to see a specific definition in the rule set though.