Exhaust Question
#6
Rotors still spinning
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With a 2 1/2" muffler there is really no point in having the 3" exhaust pipe from the turbo. You are adding a restriction back to the system. If you are going to do this then you may as well run 2 1/2" all the way from the turbo. The car will run just fine but you may see a little quicker spool up and a little more horsepower from the 3" muffler. It may be a similar effect to running with and without a cat. On a turbo no exhaust is best so go as large as possible. There is a way to make a smaller pipe work but this isn't it. One thing that could be beneficial is if you run the turbo straight into a larger pipe such as 3 1/2" to 4" and then taper it down to a smaller size around 3" about a foot later. This has a neat effect on turbos of helping to simulate no exhaust but only if the piping size chosen is large enough.
#7
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I was just wondering...because before i had a 3" muffler on it, but it was just too loud, so i put on the stock muffler. I noticed that when i had the 3" muffler, the turbo would always be spinning...even at low rpms, but now that i have the smaller muffler...it only spools up when i punch it or when i'm at higher rpms.
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#9
...94% correct.
#10
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just wondering... what if from the 3" pipe to a y-pipe 3" inlet-2.5" outlet then two 2.5" mufflers? would that be somewhat similar as 3" straight thru? or just any piping from bigger size to two smaller size?
#12
Originally posted by Spawn VII
just wondering... what if from the 3" pipe to a y-pipe 3" inlet-2.5" outlet then two 2.5" mufflers? would that be somewhat similar as 3" straight thru? or just any piping from bigger size to two smaller size?
just wondering... what if from the 3" pipe to a y-pipe 3" inlet-2.5" outlet then two 2.5" mufflers? would that be somewhat similar as 3" straight thru? or just any piping from bigger size to two smaller size?
I like singles though. Less bends, less restrictions, less weight. They are just a little louder generally (true duals aside )
#13
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Originally posted by Spawn VII
what if from the 3" pipe to a y-pipe 3" inlet-2.5" outlet then two 2.5" mufflers? would that be somewhat similar as 3" straight thru?
what if from the 3" pipe to a y-pipe 3" inlet-2.5" outlet then two 2.5" mufflers? would that be somewhat similar as 3" straight thru?
A dual system will weigh more, but the difference is a tiny fraction of the car's total weight, so the chances of you actually noticing it are slim.
The big advantage of a dual system is that two parallel mufflers work much better at reducing noise than a single one. While exhaust volume is always a personal preference, the authorities may not necessarily agree with your preference...
Cost is a non-issue. Either you're happy to pay a bit extra, or you're not.
BTW, I believe RB's system splits into two 2.25" pipes (I may be wrong), which won't flow as well as a single 3".
#14
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I was just wondering...because before i had a 3" muffler on it, but it was just too loud, so i put on the stock muffler. I noticed that when i had the 3" muffler, the turbo would always be spinning...even at low rpms, but now that i have the smaller muffler...it only spools up when i punch it or when i'm at higher rpms.
Goodluck
#18
Rotary Motoring
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Yes, presilencers help quiet the exhaust note tremendously!
If you had a 3" single system w/ no presilencer I can imagine it was loud. I have a 3.5" turbo back single w/ only 1 muffler and it is INCREDIBLY loud w/ the tip silencer removed.
I mean, I had an NA and drove it on w/ only the thermal reactor and two precats and it was actually quieter!
Your presilencer must be stainless and have stainless or ceramic packing to stand up to the heat! I have heard Borla XR-1 mufflers work well.
If you had a 3" single system w/ no presilencer I can imagine it was loud. I have a 3.5" turbo back single w/ only 1 muffler and it is INCREDIBLY loud w/ the tip silencer removed.
I mean, I had an NA and drove it on w/ only the thermal reactor and two precats and it was actually quieter!
Your presilencer must be stainless and have stainless or ceramic packing to stand up to the heat! I have heard Borla XR-1 mufflers work well.
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