SSI's ?

[HarryD]

I guess I'm kinda slow.

I thought one of the "true" advantages of SSI's is that they allow post 74 Porsches get the performance advantage of the tuned exhuast that the early cars had as a stock feature. The fact SSI's are more corrosion resistant is just icing on the cake. For us early car owners, I would not expect much of a performance change between the stock and SSI exhaust systems since our headers are already "tuned".

[rst73]

Ok Tom,

Since I was called out, I will weigh in on this one. Please forgive me as I am going to have to rely on memory as I can't find the very old Porsche Service Bulletin. Around 77-78, Porsche issued a bulletin recommending removal of the air cleaner intake preheater on 72 and later MFI engines due to road debris ingestion issues. Also the intake preheating benefit was negligable except in extreme sub-zero conditions. The main reason for the intake preheater was for emission reduction on initial start up.
I removed the set up when I built my 2.7 RS engine almost twenty years ago. I installed SSI's and used the rear tin from a carburated engine (no hole). The set up has worked very well for me. Hope this helps.
All the best!
Roger Grago
PORSCHE Newport Beach
R Gruppe #27

[sithot]

Here's one for you.

Tom

[sithot]

Originally posted by rst73
Ok Tom,

Since I was called out, I will weigh in on this one. All the best!
Roger Grago
PORSCHE Newport Beach
R Gruppe #27

Now, here's a man with a memory. I knew that it wasn't a rumor or that I dreamed it up. Thanks, Roger.

Best,

Tom