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Thread: BA I6 Exhaust Sizing... What are your thoughts ?

  1. #1
    Senior Member 13726548's Avatar
    Join Date
    Jun 2015
    Gold Coast

    Thumbs up BA I6 Exhaust Sizing... What are your thoughts ?

    For nearly 10yr's i have taken great joy in changing zorst's on my falcon...

    2.5" to 3" to 4" back to 3" and finally my first ever stainless system now back to 2.5"

    I ran my best ET with 3"

    I ran my best mph with 3"

    I made my highest dyno number with a 3"

    So why change you may wonder ?

    For too many years I have debated I'm right everyone else is wrong when I have tried new ideas on my car's and I never did get that elusive 12sec timeslip no matter how many tuners I visited...

    I think I'm getting older and regardless of how modified this turd is I still need to be mindful of my neighbors and bolting on a quieter system may go some way to stop them from ringing the police on me when I get home at 4am lol.

    For anyone interested I am going back on the dyno shortly to get a torque graph for comparison reasons.

    Not interested in racing this anymore it's more a show car now and of course I may change my mind in the future but for now it is about being a sedate mature motorist.

    A lot of guys have gone from smaller to larger and to my knowledge no one has gone back down in size for any reason ?

    So I am super keen to see if my bumometer is still accurate and i will post my findings later in the week .

    I couldn't find an exhaust related thread anywhere so I stuck this in here, admin please feel free to move.

    Cheers Daz

  2. #2
    Validated User WASP's Avatar
    Join Date
    Jan 2012
    The factory diameter (for a turbo model at least) is 2.5" I think, but not sure what the N/A version was. 2.5" should be fine for most street applications, but if you are chasing HP and torque, particularly in the mid to upper range I would have thought the 3" to 3.5" system would be more suitable. Being a considerate neighbor is important, so instead of buying a whole new cat back system I personally would have ingestigated bimodal insert options for your 3" so you can close a valve to make the exhaust quite on-demand. That way everyone is happy. This is just an example and may not be suitable for your car, but food for thought

    Lifetime proud Ford Falcon enthusiast and previous owner of the following models XR, XY, XB, XC, XD, EB, AU, BA and FG.
    Current owner of a BA Mk2 FPV GT and a FG XR6 Turbo

    Mustang enthusiast and current owner of a 1969 Mach 1 351 4V 4-barrel M-Code + 2018 Mustang GT 10 speed

  3. #3
    Validated User Road_Warrior's Avatar
    Join Date
    Mar 2012
    In the cockpit. Cruisin' mah hood
    My thoughts exactly - a bimodal muffler or a similar operating system somewhere in the pipe so you can still be civil to your neighbours but literally open the taps when you.., err, open the taps.

    I had a motorbike with a muffler like this, used to open at around 6000rpm (also roughly when the 'shower' injectors kicked in) and the bastard used to go mental. I loved it!

  4. #4
    Senior Member 13726548's Avatar
    Join Date
    Jun 2015
    Gold Coast
    Well I went X-Force...

    All the hwy drone has disappeared and the Torque definitely feels like it has improved even tho the car is heaps quieter

    Win win

  5. The Following User Says Thank You to 13726548 For This Useful Post:

    WASP (6th November 2017)


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