exhaust size?
February-24th-2003, 05:40 PM
#1
Protege Newbie
Thread Starter
Join Date: Feb 2003
Location: kentucky
Posts: 28
exhaust size?
What is the stock exhaust size for our piping. I was thinking of getting cat-back exhaust and want to know what size yall think i should get.( i was thinkin' 2.5", what do yall say?)
February-24th-2003, 07:24 PM
#2
Boss of you
Join Date: Dec 2001
Location: Central Texas
Posts: 171
Bigger does not equal better (in this case, anyway)
Lose all your back pressure and your torque goes out the window. You just want to relieve excessive back pressure.
2.25" is as large as I would go. With a high flow cat and muffler, I would venture to guess 2.0" might even be ideal for the mighty 1.5 liter motor.
Lose all your back pressure and your torque goes out the window. You just want to relieve excessive back pressure.
2.25" is as large as I would go. With a high flow cat and muffler, I would venture to guess 2.0" might even be ideal for the mighty 1.5 liter motor.
February-24th-2003, 08:23 PM
#3
Oil Change Enthusiast
Join Date: Apr 2002
Location: Norwood, MA
Posts: 1,587
Originally posted by davens
Bigger does not equal better (in this case, anyway)
Lose all your back pressure and your torque goes out the window. You just want to relieve excessive back pressure.
2.25" is as large as I would go. With a high flow cat and muffler, I would venture to guess 2.0" might even be ideal for the mighty 1.5 liter motor.
Bigger does not equal better (in this case, anyway)
Lose all your back pressure and your torque goes out the window. You just want to relieve excessive back pressure.
2.25" is as large as I would go. With a high flow cat and muffler, I would venture to guess 2.0" might even be ideal for the mighty 1.5 liter motor.
February-25th-2003, 06:22 AM
#5
Boss of you
Join Date: Dec 2001
Location: Central Texas
Posts: 171
Go look at diameters of tuned exhaust systems for other comparable sized cars. Most are around 2.25"...why didn't they use 2.5"? I'll bet the loss of torque vs tenths of horsepower at redline made the tradeoff not worth it.
Sure, you'll see a 2.5 on a larger car or forced induction car...apples and oranges.
I think Even Mazdaspeed uses the same catback unit for both 1.5 and 1.8. If it's good enough for a 1.8, it'll definately work for the 1.5.
and mandrel bends...not crush bends
Sure, you'll see a 2.5 on a larger car or forced induction car...apples and oranges.
I think Even Mazdaspeed uses the same catback unit for both 1.5 and 1.8. If it's good enough for a 1.8, it'll definately work for the 1.5.
and mandrel bends...not crush bends
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