Muffler Pipe Diameter; is bigger better?
Muffler Pipe Diameter; is bigger better?
Hello all,
I need a new y pipe, since mine is rusted to *****, I'm thinking about having a shop build me one, since I want to eliminate the middle muffler (GS 400). I have the RMM rear mufflers, but I have noticed that the pipes on the RMM's are a bit wider in diameter, should I get the rest of the exhaust in the same diameter as the RMM pipes? will it affect performance negatively or positively?
Thanx in advance.
I need a new y pipe, since mine is rusted to *****, I'm thinking about having a shop build me one, since I want to eliminate the middle muffler (GS 400). I have the RMM rear mufflers, but I have noticed that the pipes on the RMM's are a bit wider in diameter, should I get the rest of the exhaust in the same diameter as the RMM pipes? will it affect performance negatively or positively?
Thanx in advance.
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Stock is 50mm (1.97") duals into a 60mm (2.36") single.
Any replacement should have the goal of high velocity, low restriction and good scavenging.
The stock does that well.
IF... and that is a giant IF... you build an EXCELLENT scavenging Y or X section (hard to do and for a street car not the same as a race car) the best size for most people is 2.00". Many run 2.25" but there is no real advantage and some negatives. Remember you want the SMALLEST pipe size that will support the power you are making for a STREET car. Especially a heavy car with a small engine. 4.0 liters is not a large engine in a 4000 pound car. Also, bigger pipe will reduce low end torque and response, weigh more and be harder to package.
STOCK for the Y pipe up to 325hp or so.
Any replacement should have the goal of high velocity, low restriction and good scavenging.
The stock does that well.
IF... and that is a giant IF... you build an EXCELLENT scavenging Y or X section (hard to do and for a street car not the same as a race car) the best size for most people is 2.00". Many run 2.25" but there is no real advantage and some negatives. Remember you want the SMALLEST pipe size that will support the power you are making for a STREET car. Especially a heavy car with a small engine. 4.0 liters is not a large engine in a 4000 pound car. Also, bigger pipe will reduce low end torque and response, weigh more and be harder to package.
STOCK for the Y pipe up to 325hp or so.
.............
Stock is 50mm (1.97") duals into a 60mm (2.36") single.
Any replacement should have the goal of high velocity, low restriction and good scavenging.
The stock does that well.
IF... and that is a giant IF... you build an EXCELLENT scavenging Y or X section (hard to do and for a street car not the same as a race car) the best size for most people is 2.00". Many run 2.25" but there is no real advantage and some negatives. Remember you want the SMALLEST pipe size that will support the power you are making for a STREET car. Especially a heavy car with a small engine. 4.0 liters is not a large engine in a 4000 pound car. Also, bigger pipe will reduce low end torque and response, weigh more and be harder to package.
STOCK for the Y pipe up to 325hp or so.
Any replacement should have the goal of high velocity, low restriction and good scavenging.
The stock does that well.
IF... and that is a giant IF... you build an EXCELLENT scavenging Y or X section (hard to do and for a street car not the same as a race car) the best size for most people is 2.00". Many run 2.25" but there is no real advantage and some negatives. Remember you want the SMALLEST pipe size that will support the power you are making for a STREET car. Especially a heavy car with a small engine. 4.0 liters is not a large engine in a 4000 pound car. Also, bigger pipe will reduce low end torque and response, weigh more and be harder to package.
STOCK for the Y pipe up to 325hp or so.
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