After doing search after search, it seems nobody bothered to weigh the exhaust.
so to make it easier for people who are doing a search for the weight of the exhaust I figured I would start a new thread.


Today my mazdaspeed exhaust came in, and the exhaust looks great! and the best part is it weighs 33 Lbs. Which is almost 7lbs off the stock exhaust!

Also, the Rx8 store high flow cat is 11 lbs 5 oz.

 

good info.
One of the mods should add this info to the first post in the Sticky for Exhaust information.

-hS

 

Whats the stock cat weigh?

 

added

 

The weight of the stock Cat is 23 LBS 2 oz

 

Not bad, the resonated/catless midpipe is 10.8 lbs. Nice to know the high flow cat isn't too much more.

 

Does the weight really make a difference in performance? The RX-8 isn't exactly built to be fast from low weight. 20 or even 7 pounds might make a difference on a Lotus Elise or Exige but I doubt it would on our cars. If you want to save weight delete your AC (unless it gets very hot where you live in the summer). Also, lighter flywheels make a huge difference on cars - especially in 1st gear. Maybe I'm wrong but it seems like the bigger pipe would be more to look at than weight for performance.

 

On average for most cars, every 100 lbs is ~ 0.1 sec off the quarter mile.

The AC doesn't weigh anything really.


Best place to remove weight, for the most difference, would be rotational weight (ie wheels, tires, etc.). But in reality it ALL adds up. Remove 7 lbs from exhaust, 20 lbs from wheels, maybe a few from lighter tires, cut the fat in other places... it will all add up eventually. I've gotten up to 50 or 60 (can't remember) pounds so far just from exhaust and other simple things. Full interior, nothing noticeable gone, and still have stock wheels/tires.

 

With FULL interior, my car weighs in at 2890 Lbs and thats with the Greddy turbo kit.

so my answer to your question, yes it makes a HUGE difference. When you add everything up, you would be suprised in how much weight you can take off the 8 and still have it look normal.

 

What else have you done to remove weight besides exhaust?

 

I should also add that my car is a GS model which is 2960Lbs stock



Here are the 4 biggest weight savers

Stock air filter with Vfad replaced with greddy turbo air fiter saved 11 LBS 1 oz
Stock battery with plastic cover replaced with dry cell saved 26 LBS 8 oz
Washer fluid tank *Full* 14 LBS 5 oz
Jack with plastic case and emergency kit 11 LBS 1 oz

 

Did you actually weigh your car or are you estimating the weight of your car based on those weight savings you listed?

 

i never thought about the washer fluid, i can't believe thats freakin just about 15 pounds. Great save on the battery also

 

in the place of the washer fluid used to be, place your light weight battery there.
I was shocked in how more responsive the steering became!

 

What brand is the lightweight battery and where did you get it from?

Regards
Rexi

 

its anODYSSEY Drycell PC 680 MJT

Here's a link to their web site

http://www.odysseybatteries.com/battery/pc680mjt.htm


I have been running it for 2nd summer now and I have no problems with starting up the car. I drive my car only during the summer time, so I dont know how well the battery would perform when it gets cold. Also its around $80US so its not that expensive as the Braille battery

 

No answer?