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Discussion Starter · #1 ·
What is the diameter of the exhaust pipe on the coupe? Is it 3 inch, 4 inch? I am sure a larger diameter will help to relieve back pressure so I am wondering what it already has versus what it should have... Or a better question is what is the optimal size? Is the Larini a different size from stock?


Anyone here know?
 

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Discussion Starter · #4 ·
Steering Rack...

Jeff's Quote:

"2.5" on the Maserati. Larini is the same size. The Maserati does not have much back pressure once the mufflers and X-pipe have been installed. The only remaining restriction is under the steering rack. We'll have something for that soon.

Once we go with forced induction this may be a problem, however we'll cross that bridge soon enough."


Reponse: I was wondering about that as well, it's a nice kink in there and has to restrict exhause flow. Let me know when you have this done, I need to up the exhaust system next, it's way to restrictive with the new ECU and the DBW, the cats are getting hot with the extra fuel, etc.

Response to GCalo: So the rule of thumb is same diameter as the largest exhaust value diameter... Now I do remember starting the engine in a drag car, getting it hot and then spraying paint on the exhaust pipe until it quit burning and then cutting off the pipe at that point to keep it from burning the exhaust valves. So you do need some back pressure, but really the optimum amount?
 
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