another round of weight loss

[cslsuperfan]

Originally Posted by Mike R

That is how my car came - I found that although the induction noise was much more prevalent over the exhaust, it sounded way to raspy IMO.

Now the induction noise and the exhaust (with the SS Race back-box) fight for dominance of who is loudest .

Been running the full SS system with non res Centre section.

Airbox certainly has a fight on its hands to be heard.

[khooni]

Originally Posted by billyboysm3

Ive gone AKG Solid all round and solid front control arms but on track M3.

Supersprint non res is a extra 3DB and Supersprint Cats is also a extra 3DB

I had Cats, non res pipe and lightweight race = 105/106DB at Snett.

Then tried every alternative, the CSL now has SS cats, SS non res and OEM back box and I find that is the best sound.

Would love a few laps in the CSL with the intrax and cage.

Billy

tks for your answer. would love to take you next time i'm out on track

think i am going to stick to the stock exhaust for now as i have really no complaints about the intake noise. I was just doing this for weight loss but having worries on a brands gp day at 101dB static is something I can do without.

i thought that since the stock setup only registered 88db for some reason, I was never going to put 10db just by getting the resonator and back box. But it does seem like guys are getting up to 105/6db with race cats + resonator+race box. shame. I guess I have to look for weight loss some other way.

[cslsuperfan]

Originally Posted by khooni

tks for your answer. would love to take you next time i'm out on track

think i am going to stick to the stock exhaust for now as i have really no complaints about the intake noise. I was just doing this for weight loss but having worries on a brands gp day at 101dB static is something I can do without.

i thought that since the stock setup only registered 88db for some reason, I was never going to put 10db just by getting the resonator and back box. But it does seem like guys are getting up to 105/6db with race cats + resonator+race box. shame. I guess I have to look for weight loss some other way.

Khooni

have you considered Recaro Spa's?

2.5 Kgs carcass and 3 kgs for runners. I realise they're budget busters but a good quality second hand seat could net 5-10 kgs saving over GRP Recaro's or oem seats.

[billyboysm3]

Originally Posted by khooni

tks for your answer. would love to take you next time i'm out on track

think i am going to stick to the stock exhaust for now as i have really no complaints about the intake noise. I was just doing this for weight loss but having worries on a brands gp day at 101dB static is something I can do without.

i thought that since the stock setup only registered 88db for some reason, I was never going to put 10db just by getting the resonator and back box. But it does seem like guys are getting up to 105/6db with race cats + resonator+race box. shame. I guess I have to look for weight loss some other way.

Nah, get a 3 inch straight through pipe and single exit, and save the oem weight, approx 23kg, probably cost a grand. It's my next mod in winter.

I can pm you details.

[khooni]

Originally Posted by cslsuperfan

Khooni

have you considered Recaro Spa's?

2.5 Kgs carcass and 3 kgs for runners. I realise they're budget busters but a good quality second hand seat could net 5-10 kgs saving over GRP Recaro's or oem seats.

I currently have recaro spg. not as light as spa but cheap.... came with the car. not worth it to upgrade for me since i don't have the original seats to sell for ££££

[khooni]

Originally Posted by billyboysm3

Nah, get a 3 inch straight through pipe and single exit, and save the oem weight, approx 23kg, probably cost a grand. It's my next mod in winter.

I can pm you details.

please do.

[cslsuperfan]

Originally Posted by khooni

I currently have recaro spg. not as light as spa but cheap.... came with the car. not worth it to upgrade for me since i don't have the original seats to sell for ££££

Its worth keeping an eye out for second hand spa's.

Alex AKA Karbonkid bought a carcass and had it re upholstered DIY.

[Mike R]

Originally Posted by billyboysm3

Nah, get a 3 inch straight through pipe and single exit, and save the oem weight, approx 23kg, probably cost a grand. It's my next mod in winter.

I can pm you details.

Before you go down this route, I would research this a great deal, as I have seen cars fitted with just the cross-over section in a different position that then messes with the back pressure and cause all sorts of weird issues with the VANOS, where the cars lost 30-40bhp in the mid-range due to the VANOS becoming confused and not working properly. There is a big thread about it on the M3forum. A big exhaust manufacturer had to completely redesign their exhaust because of the issues.

[rstoughy]

Originally Posted by Mike R

Before you go down this route, I would research this a great deal, as I have seen cars fitted with just the cross-over section in a different position that then messes with the back pressure and cause all sorts of weird issues with the VANOS, where the cars lost 30-40bhp in the mid-range due to the VANOS becoming confused and not working properly. There is a big thread about it on the M3forum. A big exhaust manufacturer had to completely redesign their exhaust because of the issues.

Mine had Silencer's where the cats should be. Due to the class regs I had 2x 100cell cats fitted. That gained me 10bhp

[Mike R]

Originally Posted by rstoughy

Mine had Silencer's where the cats should be. Due to the class regs I had 2x 100cell cats fitted. That gained me 10bhp

These cars were gaining a small amount at the top end, but loosing huge amounts in the mid-range, so the power step "felt" good, but the reality was a loss of area under the graph.