Guys I am currently in the process of building and testing an aluminum cat back for the RX8 and RX7. I am wondering if there is any interest in this product. The weight savings is huge over SS cat backs. The muffler alone weighs less than 2.5 lbs.

Feed back greatly appreciated.

 

Crickets??????


I really thought someone would be interested in an exhaust that weighed in under 20lbs and possibly lighter.

 

How much is it gonna be? That is the most important part.

 

single or double?

 

Hmm light weight is good... Single can? I'd also like to know how loud its gonna be.

 

number of mufflers, single/dual outlet, resonators, s2 hangers? more info peez

 

I am looking to do a cat back this spring. So if price and sound is right I would be very interested. But it would have to be a dual outlet.

 

Single exit on passenger side, 3" the whole way through and lighter than an HKS Hi-Power and I'd be REALLY interested.

 

Aluminum is seldom used as a material for exhausts, even in cases where there are huge premiums for weight savings. There are good reasons for this:

http://www.burnsstainless.com/yieldstrength.aspx

Add the fact that exhaust pulses and temperatures are more severe with rotary engines than piston and I'll guess an aluminum catback will be either cracked or semi-melted very quickly. Build it, do before/after dyno, run it for 10k miles, then get back with a product to offer. Good luck.

 

Thanks for the article. Fortunately I have been building exhausts for a bit and I have 5 cars to test the prototypes for some time. On top of that I stand behind all my products.

Pics next week.

 

I'm interested.

 

I would like to see how this turns out, but I'm as interested in long-term durability as I am in weight savings. Are you planning to reinforce or internally coat the exhaust?

 

If you need a guinea pig for testing i'm available

 

great minds think alike

 

Jantzen come by the shop this next week and lets talk. Jim I know I'll see you soon since I have your motor so we can talk then.

RX I will not sell something that will not hold up so no worries. I am trying to keep up this week so I have not had time to upload pics yet. I will this next week.

Brad

 

is it passenger exit??

 

not unless you provide a warranty, which you won't be in business long after they all start breaking

I new that motoiq article would start this up again, you won't be the first to try it, better do your homework first

 

knew*

 

+1

Alu isnt durable enough for exhaust systems.

 

The application in Moto IQ was much different and aluminium was not used in the whole system. I am excited to see how well this holds up.

Please be sure to include any epic failures along with any great success in picture format.

 

I have no idea what article your talking about so ???? Thanks for the feed back. The product is in testing and that is why its not for sale yet. I'll post pics this up coming week and we will see how it holds up.

 

Week's up ....

 

Do you have any ideas of a price point you are aiming for?
Is it going to be in the $400-$600 range or the $1500-$2000 range. That would depend on how interested I would be.

 

Aluminum mufflers haven't held up well in street cars. Corrosion from road salt on the outside and emitted acids and moisture on the inside have done them in. I am skeptical, but you may be using an alloy that can withstand the environment and conditions.
The Corksport dual muffler exhaust is 27lbs. and made of stainless steel. Mine has lasted 7 yrs. now. I don't know how much lighter an aluminum exhaust, of the same configuration, could be. It's weight is the primary reason I wanted that system.

 

Has anyone actually measured the temps of the exhaust pipe at different points?

Based on the purple heat tint, I'm guessing my SS exhaust gets up to 850F even near the exit. Based on that article, even Ti is not suitable. Seems like Al might just outright melt.