Sports Exhausts

[nick3814]

I'm starting to look at some stainless sports systems for my 1983 SC, can anybody recommend any particular systems?
I've had quotes for a full system from Hayward & Scott and Quick Silver, both look fantastic systems but are around £1800, I was hoping to get it under £1000, was this optamistic?

 

[bones]

Are you looking for just the back box Nick or a backdate to the earlier system with equal length headers and no power sapping crossover pipe?

 

[nick3814]

I would like a straight through system, bit more bhp and a nice noise.

 

[bruceb]

Nick

The main bit to worry about are the heat exchangers, you could fit SSI's which are beuatifully made in stainless steel in the USA and will last as long as the car. I think these can be purchased for about £700-£800 a pair. To keep costs sensible fit a mild steel silencer 2 in 1 out original Porsche items can be had for about £150. There are some modifications to the oil lines requird and I believe these are approx £150 for a car set. So its possible to keep the bits to around a £1000.

I did this fit to my car about six years ago, it sounds great and I have had no corrosion problems at all with the mild steel silencer. It is slightly noisier than a car with a standard exhaust though.

Bruce

 

[jerry911sc]

The power increase part it an interesting one.

Doing what you suggest is probably IMHO worth it for the sound if the existing heat exchangers's are either a) shot or b) good enough to sell. I say this after hours of research JZ (who service my SC) were adamant that there was no performance gain from performance exhausts and I couldn't find anyone prepared to commit to giving increased power let alone maintaining the same or better torque as well. JZ said that the only system they ever dyno'd that didn't produce a loss over standard was a Ruff system.

OK so what would JZ know about SC tuning - to my surprise quite a bit when pushed. Not only have they done a lot of work on SC's, at least one of the JZ guys has owned them and their technical director Steve successfully prepared SC race cars for several years. Apparently for at least one car Steve re-built the top end for each race just to keep it at peak performance.....

One or two other outfits were keen to sell me a performance exhaust initially but got cold feet at the prospect of a before and after dyno.

In the end I got a very smart Dansk back box and side box in stainless steel plus sundries for £680 fitted.

Pete's (Pete Spence SC Register Sec) SC has a BHP increase from an impressive mod but that is not a straight through system it s a Triad.Cue Pete !

 

[bruceb]

Jerry--I agree with you on the power issue, I noticed no difference with the SSI system compared with the standard mild steel exhaust. The main difference is a great sound and a good heating system.

 

[bones]

JZ have a wealth of tuning experience regarding SCs including engine mods. Most 'sports exhaust' manufacturers claim power increases but never quote measured figures over stock in a scientific fashion. All 911s suffered a strangulation of their power outputs after the equal length header system was abandoned in the mid seventies and replaced by the 6-1 sytem the SCs suffer from. A 'sports' exhaust is only worth fitting if you like extra noise or have equal length headers fitted, they will probably rob the engine of power if they are badly designed. Porsche made a good job of combating the emmissions controls placed up on them so the stock exhaust is not too bad, it's what comes before it that's the problem. I chose my system based on recommendation from respected engine tuners, racers and dyno figures.

 

[nick3814]

Pete, what system do you have on your SC and what did it cost if you don't mind me asking.

 

[jerry911sc]

Having just spent a grand on wheels and a service I didn't didn't have the readies at the time my exhaust blew, otherwise I would have gone for a Triad too[].

 

[bones]

I run '73 mild steel HEs and a Triad West Performance 2 in 2 out mild steel rear silencer. (you have to modify the rear valence). The HEs were £180.00 the pair from PRO-9 used (very good condition though), the exhaust was £233.00 inc shipping and tax (I got lucky on the tax) and I bought the oil lines from Berlyn services for a reasonable price , it was less than £200.00 I think. I try and avoid driving in the wet salty conditions of winter so stainless steel is not a requirement for me.

 

[nick3814]

Thanks Pete, I have no intentions of using mine in salty conditions either and I have heard that mild steel systems give a better sound than a stainless system due to the way the different metals resonate, what do you think?

 

[bones]

I like both metals, my exhaust is not too loud at idle but sounds like a 70's rally spec Porsche on full song, I like the characteristic rasp of stainless as well.