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Thread: Catalytic converter

  1. #1
    Join Date
    Apr 2016
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    Catalytic converter

    Any you guys have any comments on cutting off the rear cat do you lose low-end torque

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  2. #2
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    I would think it would not make a difference other than exhaust tone.
    2004 MM (Black) #112 of 3213 (SOLD)

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    formerly owned by "Impala Slayer!! 2004 SB MM
    Kenne Belle 2.8 (Liquid Cooled), MMR "Boss 302" Block, L&M Engines rebuild Kooks Headers and cats, Accusump Pre-Oiler Dynamax VT mufflers, MBS 2 1/2" exhaust, 4.10's, 2800 stall, Argento 312 "Color" Powder coated wheels, Rears widened 1 1/2 "703
    702 RWHP/653 RWTQ @ 21 Lbs. Boost, M/M catch can, 3 pillar gauge (Boost, Fuel, air intake and coolant temp, custom console cover, S-55 treatment etc...

  3. #3
    Join Date
    Jun 2011
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    Northeast OH
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    it effects nothing, plenty have done it here, sounds better
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  4. #4
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    That's kind of what I thought but I heard from a few people that you lose a little low and talk with that but I think I will do that thanks for the input

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  5. #5
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    Damn autocorrect supposed to say low end torque

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  6. #6
    Join Date
    Jun 2011
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    doubtful you lose torque..anyone with a power adder already has it removed, prolly half the memebrs here have it removed...the hard part is getting it removed if you do not do it yourself..Muffler shops wont remove a converter, even if it doesn't monitor anything..they risk fines for doing it
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  7. #7
    Join Date
    Jan 2003
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    Near Knoxville TN
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    Just more noise.
    Thanks to Darrin @ BC Automotive:
    $1800 and it was worse than when he started!

    Brian (FordNut) FPG # 1458 of 7838
    03 MM 300A (Lotsa mods, 130k mi) was 303rwhp/318rwtq N/A
    then 476/410 D1SC ProCharged on stock block
    then 660/555 D1SC PC on 5.3 wet sleeved Teksid alum big bore stroker
    then 365/369 N/A on 5.3 wet sleeved Teksid alum big bore stroker
    Now 751/617 3.4L Whipple on 5.3 Boss5.0 iron big bore stroker

    03 MM 300B Silver (Mostly stock, originally wife's car, 370k mi) FPG # 7053 of 7838 or 49 of 417 SB
    03 MM 300B Silver, Stock, wife's next one, 136k mi FPG # 7134 of 7838 or 89 of 417 SB
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  8. #8
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    Rear cat delete and 4.10s, You'll get more smiles per gallon.


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  9. #9
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    Apr 2016
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    fergus falls mn
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    Just got my cat's cut out man what a difference good tone

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  10. #10
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    Quote Originally Posted by badass mm View Post
    Just got my cat's cut out man what a difference good tone

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    All 4...?


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  11. #11
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    Apr 2016
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    No just the rear

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  12. #12
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    No just the rear 2

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  13. #13
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    Does anybody know if the old cats are worth any money

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  14. #14
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    Oct 2005
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    Southwest Florida, Lee County
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    Mine is pretty loud with Super40's on it. I am wondering if rear cat delete would be a mistake...

    Who has loud mufflers AND cat delete? What's your opinion?
    '04 Silver Marauder w/ sunroof - HID lighting, JL Audio / Eclipse DVD/NAV/iPod/camera, 4.10's, 2" drop, Progard Bumper Baffle, Delete tips, Billet Pedals, BC4E dead pedal, Lidio Tune, Mach1 chin spoiler, K&N CAI, TCE lines, Super40's, tinted tails, SS Inserts, Heinous Control Arms, Real oil gauge, lighted door handles. Currently installing Eaton M112.

    2004 Mercury Marauder
    Born March 2004, adopted October 2005. Sold January 2012, adopted AGAIN January 2016
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  15. #15
    Join Date
    Apr 2016
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    I just have turbos on mine and 50% louder than it was

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