JohnBradley's 2011 car update.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
Latest pix-
To answer the question, my aeroturbine was 4" in 4" out and next to nothing other than make the car look legal. The Magnaflow is a 3.5" in offset to 3.5" centered out. The difference were non existent to 26psi and 650whp where the car had done 657 before it was only making 645-650. I turned the boost up to 32psi where it had done 746 now it was 715, 38 it made 794 now 739.
This means one of 2 things, either its hurt or its the muffler change. It doesnt smoke or rattle, no boost leaks, I rip on it at 30+psi still and have for quite a few customers. Its not the clutch (triple) as it still holds as much torque as I care to throw timing to it.
I am very open for suggestions though if its not the muffler. In talking to FP this afternoon I was reminded of my education about head pressure in the exhaust and expansion ratio directly affecting pre turbine backpressure. I tend to think its the exhaust.
Magnaflow 12909 is the part number.
To answer the question, my aeroturbine was 4" in 4" out and next to nothing other than make the car look legal. The Magnaflow is a 3.5" in offset to 3.5" centered out. The difference were non existent to 26psi and 650whp where the car had done 657 before it was only making 645-650. I turned the boost up to 32psi where it had done 746 now it was 715, 38 it made 794 now 739.
This means one of 2 things, either its hurt or its the muffler change. It doesnt smoke or rattle, no boost leaks, I rip on it at 30+psi still and have for quite a few customers. Its not the clutch (triple) as it still holds as much torque as I care to throw timing to it.
I am very open for suggestions though if its not the muffler. In talking to FP this afternoon I was reminded of my education about head pressure in the exhaust and expansion ratio directly affecting pre turbine backpressure. I tend to think its the exhaust.
Magnaflow 12909 is the part number.
that type of power lose i would have left the other muffler on.
my exhaust is pretty quite now. i ran a 3.5 dp to a burns muffler at the cat and a 3.5 dp back to a TI 3.5 ID muffler. that was loud but enjoyable.
now i run the same 3.5 inch dp to a 3.5 aluminum dp back with only the ti muffler and it some how became even quieter. which is a good thing.
i had the ETS aeroturbine muffler. that thing screams. maybe look into other muffler options Aaron.
my exhaust is pretty quite now. i ran a 3.5 dp to a burns muffler at the cat and a 3.5 dp back to a TI 3.5 ID muffler. that was loud but enjoyable.
now i run the same 3.5 inch dp to a 3.5 aluminum dp back with only the ti muffler and it some how became even quieter. which is a good thing.
i had the ETS aeroturbine muffler. that thing screams. maybe look into other muffler options Aaron.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
that type of power lose i would have left the other muffler on.
my exhaust is pretty quite now. i ran a 3.5 dp to a burns muffler at the cat and a 3.5 dp back to a TI 3.5 ID muffler. that was loud but enjoyable.
now i run the same 3.5 inch dp to a 3.5 aluminum dp back with only the ti muffler and it some how became even quieter. which is a good thing.
i had the ETS aeroturbine muffler. that thing screams. maybe look into other muffler options Aaron.
my exhaust is pretty quite now. i ran a 3.5 dp to a burns muffler at the cat and a 3.5 dp back to a TI 3.5 ID muffler. that was loud but enjoyable.
now i run the same 3.5 inch dp to a 3.5 aluminum dp back with only the ti muffler and it some how became even quieter. which is a good thing.
i had the ETS aeroturbine muffler. that thing screams. maybe look into other muffler options Aaron.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
How much did the sound change between the mufflers? I remember when I started and exhuast size thread, it was brought up that certain sound waves would help/hurt flow.
That could be a cool test, use a db meter with differnt mufflers. db's vs hp
But anyways I would say try a vibrant race muffler http://vibrantperformance.com/catalo...Path=1022_1032 they have both Al and SS
That could be a cool test, use a db meter with differnt mufflers. db's vs hp
But anyways I would say try a vibrant race muffler http://vibrantperformance.com/catalo...Path=1022_1032 they have both Al and SS
^Here in WA/OR, but more so WA, its more about what your exhaust looks like than sound. They care about sound dont get me wrong, but I have been given an exhaust ticket b/c the officer could "see" inside of my muffler and I was parked. 
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
It has an LS2 coil now. This thread-
https://www.evolutionm.net/forums/ex...urbo-quad.html
Latest update is the last post
https://www.evolutionm.net/forums/ex...urbo-quad.html
Latest update is the last post