Toufu, here's my thinking:
If you're loosing 25LBs in a 2800LB car... That's ~0.89% of the car's weight. It's near-as-makes-no-difference, a meaningless amount to loose.
It will make no measurable difference to any metric. [Fuel economy/tire wear/suspension wear/etc]

Amusingly, by those numbers... You're better off switching your oils to Royal Purple than worrying about the exhaust. Racing Beat tested it and gained 2% more power. XD

I'm not saying weight makes no difference [I have a friend who leaves his hatch full of crud ALL THE TIME], but as far as the exhaust goes, it really doesn't matter at all.

djSL >> No, the REV TII is quite free flowing.. Not sure where people get the idea that it isn't.. Even the regular RB exhaust is a HUGE improvement over stock.

Also, unless you're going huge with a single exhaust, you will loose flow. But then you will loose a huge amount of noise suppression for light throttle... And perhaps push you to an illegal volume for WOT. Not to mention it won't look as nice as the REV TII.

Also, for why you would care about looks on a sports car? Seriously? Because no one wants a sports car that looks like a Prius [sacrificing ALL appearance for aerodynamics]. Example: Lamborghini wouldn't make crazy looking stuff if they cared about nothing but performance.

 

You guys make it sound like a differnt exhaust will weigh zero.

 

Yet I managed to lighten my car by 130 KGs by removing a bunch of meaningless amounts of weight. Sure, this one single mod won't make a big difference, but continue the philosophy through the whole car, with every mod you make to the car, and it adds up.

Riz.

 

I agree with you, overall. Like I said, I'm not hattin', I just can't get with the single exhaust.

 

If the single exhaust you have in mind is as quiet as the RB, Id say go for it but its better to get an entire new exhaust system than to work on the existing RB.

If the T4 turbo doesnt line up correctly to the downpipe, you can always get a custom downpipe made to fit into the RB REV TII presilencer to replace the RB downpipe. Or you can get an extension pipe made to fit for the T4 turbo to the RB downpipe which would be more reasonable.

I can never go single exhaust on a street car, the extra noise from a single is too loud for me.

 

yes, but in a street car you have other considerations too.

for the exhaust its basically noise, vs weight, and maybe having a converter in it to pass smog.

so its not make the thing lighter at all costs, its more like; does making it loud make up for saving .9% of the cars weight?

i would say it doesn't in a 100% street car. in a track car it does. in a race car you have rules, so it may or may not (a turbo FC in TTC has a minimum weight of 2880lbs)

i do agree that lighter is better, and that you can take a little weight off here and there and end up with a big number, but in a street car there needs to be some balance with comfort, noise and weight balance too.

 

>Derekcat, I should of specified, but what I meant to get across was that if the previous posters thought the system was indeed that restrictive then they should just scrap it and get a single. I have the RB system myself, and it seems to do it for me.

I think it boils down to what you need/ want. Also, your state's laws with decibel level and emissions. Power goals? That is also a big factor in exhaust selection. On a rotary, I could only see a single pipe to be useful if you are a weight-scavenging hound or if you are pushing some legit power.

One last note, and this is not directed at anyone in particular if you are that concerned about weight in a street car that may never see a track day, find a different aspect of the vehicle to be neurotic about. (and take out ridiculous bajillion watt sound systems)

 

LoL. Sound system... You don't need that. That's what the exhaust is for! :-p

Riz.

 

ditch the pre silencer and keep the 2 mufflers