Hayward & Scott

[Chris_911]

I'm thinking of changing the exhaust system on my car over the winter. I dont want to disturb the heat exchangers so am looking at replacing the x-over pipe, pre-silencer and main silencer. I've admired Hayward & Scott products and they have quoted circa £800 inc VAT (but not fitting) for their stainless steel components.

Any of you guys have any direct experience of this set up?

I'm looking for a solution that gives an improvement in 'on-throttle' noise without creating any resonance or boom periods. I've no idea whether the change will free up any additional ponies and I'm probably asking too much to hope for someone having some dyno comparisons here.

Choosing an exhaust seems to be a hit or miss affair ('better' is clearly highly subjective), and the forums are awash with 'which exhaust is best threads (just like this one...).

Thoughts gratefully received.......

 

[nathan 1981 930 G50]

If you are going to stainless steel because you want them to last forever then be aware, some of the systems/parts are not fully 100% stainless steel and will rust away...

I think those "genuine" SSI type heat exchangers look the business and then you only need one silencer (twin inlet). Of course this costs a small fortune... You also need to replace one oil line with two parts as it is rerouted. My 930 has one stainless steel braided instead of the factory two oil lines but my car is far from standard anyway. Infact if it had to be replaced I will get the two factory oil lines as I am not a fan of the braided lines anyway. Porsche didn't use them on my two cars and neither will I. When my 930 was new I believe it had the same oil line as your car, it has been removed due to having aftermarket shorter heat exchangers fitted which is basically what the SSI's do and were used on all the early pre impact bumper cars.

 

[911SSC]

All of our exhausts ARE 100 % BS 304 stainless steel throught out,including FLANGES , BRACKETS and INTERNALS OF THE BOXES.

Just in case you where concerned

Ian

 

[twinny]

My H&S system is the business, as I have reported several times here and on IB. Quiet through town moving up to a really nice howl on full throttle. Dynoing pre and post fitting showed a 22bhp gain.

IMHO the best system for 3.2's for the money. Great quality too.

 

[Chris_911]

Hi Twinny

Yep - thanks for your info via IB. I'm decided on this one - going to go for single out main silencer, pre-silencer and x-over. Just deliberating on fitting - i.e. whether to do it myself or drive over to H&S (about 140 miles each way).

 

[twinny]

90+ for me each way. Ian did mine one Saturday morning. Worth it in my view. Top job.

 

[Chris_911]

Have to admit the more I think about it the more paying for fitting appeals.....

 

[lesworth]

I've pretty much made up my mind on an H&S system for next year, however I'm undecided on whther to go for single or twin outlet. My main goal is sound rather than performance. I like to sound of the twin outlet as per the wmv clip on the H&S wbsite, however, I dont want to change the tock appearance too much....hmm.

 

[tiptop topcat]

I have a sports exhaust system on my 3.3 turbo that I'm told is a Hayward & Scot but there are no records in the history (it was fitted by a previous owner).

Having spoken to others about it, I'm told that one has to expect the popping etc on over-run because its S/S and there are fewer baffles. Clearly there are others better placed than me to comment. I suspect it may also have something to do with the engine being a forced-fed beast but I'm not sure.

Mine is a single barrel outlet and the valance had to be trimmed around the bore. Which means paintwork if it is to be done properly.

It makes a HUGE noise that seems to please others more than me. Personally I'd have stuck with the standard kit or a more subtle upgrade retaining the twin pipes.

However, I do like the exhaust bark on other owners cars so would say that it is probably worth doing.

Oh an the rolling road test of a few years ago did show some improvement as the car is putting out more than its claimed output. Not bad for a 1989 car really ...

 

[Signor]

Greetings
I bought my car with a full H&S system fitted by the previous owner. New heat exchangers the lot[] I love the noise and, the old girl still pulls well at 141k miles on the clock and without an engine re-build[]
What I don't know is what is was like before the fit[:-]
But who cares........took me three months before I even fitted a stereo system 'cause the sound was so good. Apparently a full system costs just under £2k fitted. Worth every penny.
I don't where you live but if you want a quick butchers at my car send us a e-mail.[]

 

[ian cox]

Hi,
If you fit SSi's ,they are brilliant, work very well and will last a lifetime, you will need to change 2 oil lines and modify the heat exchanger plumbing to get heat into the car. The SSi system does not have this feature. You can buy a complete 3.2 SSi kit from Watson Autparts or Transend for around £1300. Increase in power is around 20bhp.
I saw some SSi's taken off a 3.0 SC that had been on for 12 years during an engine rebuild. The engine builder cleaned them with thinners and they look as good as new.
The H&S systems may have the heater part covered but not the oil lines.
You will need to check with H&S.
For the best power need to have twin outlet silencer.
To get absolute power probably need a remap asw well. the best guy is Wayne Scofield at Chipwizards.
Good luck in gettig the old system off!

 

[twinny]

Don't get too hooked up on the SSI thing, the benefits on 3.2's are marginal and mostly unfounded. Some help on 3.0 and SC's maybe.

My single outlet H&S gave me another 22-24bhp dyno proven and I defy anyone to tell you a twin outlet sounds better. Ask the guy's on the last dyno day or this weeks IB track day what mine sounds like[].

The problem you will have with the twin outlet when you come to remap or chip it is getting accurate AFR's. Most times you willl have to block one outlet off for the probe to work and give the correct reading.

 

[tiptop topcat]

Right, who is going to organise a meeting to do a comparison? How about a convoy up Esher High Street?

 

[911SSC]

ORIGINAL: ian cox
The H&S systems may have the heater part covered but not the oil lines.
You will need to check with H&S.

We desigened and built the system so as the oil pipes don't need any modification , it helps in keeping the cost down.[]

Ian

 

[nathan 1981 930 G50]

ORIGINAL: 911SSC

All of our exhausts ARE 100 % BS 304 stainless steel throught out,including FLANGES , BRACKETS and INTERNALS OF THE BOXES.

Just in case you where concerned

Ian

What about the welds ? I bet they are not 304 []

 

[nathan 1981 930 G50]

ORIGINAL: Chris_911

Have to admit the more I think about it the more paying for fitting appeals.....

Believe me it is not an easy job. I am changing my heat exchangers on my 930. It is one of those jobs I wish I never started. I would let H&S do it as they will have had lots of experience.

These are NOT from H&S. Note these are for my 930, not my 3.2 carrera.

 

[Chris_911]

Believe me it is not an easy job.

Right, where's that credit card?

Wow, those 930 bits look very tasty.

 

[911SSC]

ORIGINAL: nathan 1981 930 G50

ORIGINAL: 911SSC

All of our exhausts ARE 100 % BS 304 stainless steel throught out,including FLANGES , BRACKETS and INTERNALS OF THE BOXES.

Just in case you where concerned

Ian

What about the welds ? I bet they are not 304 []

We use 308

Ian