Opinions on Two-Piece Lightweight Rear Rotors?

[SLU_S5]

Already have the full RS5 Brake kit in the front... Now it's time to replace my rear rotors. I'm wondering if anyone has experience using lightweight (2-piece) rear rotors - with a price point less than $500, think the ECS 2-piece kit is the only option within my budget. https://www.ecstuning.com/Audi-B8_S5...ear/ES2730486/

A stock rotor weighs about 17lbs
ECS claims 18% weight savings - or ~3lbs per rotor.

Should I expect any noticeable difference if I went with with lighter rear rotors (stopping, acceleration, handling, durability, etc)? Trying to decide if it's actually worth it to pay the extra ~$300 to shave some rotating mass in the rear, or just go with slotted Stoptechs and save the extra money. They look cool, but I'm only interested if the potential performance benefit is worth the $300 premium.

Any opinions?

Thanks!

[brunogomes]

They look nice and are a little lighter, nothing that will be that noticeable tho... 6lbs total even if unsprung wont feel different. I changed all 4 and didn't notice anything to be honest.

If you really want to improve stopping power / fading you will need BBK or Carbon Ceramics (lolprice).

Either way, unless you are tracking the car the overall benefits are not that great.

They still look great and supposedly give very minor improvement... Again very minor probably not noticeable to your butt dyno.

[bknewtype]

save ur money, get stop techs. lose 6 pounds instead :)

[SLU_S5]

save ur money, get stop techs. lose 6 pounds instead :)

Stop Techs ordered. Time to hit the gym.

[ColtS5]

I'd skip any of the ECS two pice rotors.

They are made in china, and crack and warp. The cost to re-ring them is also crazy.

[wxsgt]

*Cough* JHM 2 piece