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  1. #1
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    Hackjob (Sort of) Downpipe + 2-Cat Delete

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    Sooo, I'm a little slow getting the K&N Intake pics posted mostly because I wanted that 400HP mark...

    I had my exhaust guy slap together some piping I picked out from Summit Racing and do a 2-cat delete (as we all know, there are 4 cats: two bolted to the turbos, and two bolted at the ends of the downpipe). What you're about to see looks jenky because the polished 304 stainless bends were on sale and cheaper than the non-polished 409 stainless bends. But because I was clearly trying to be cheap, the non-polished 409 straights were cheaper then the polished 409 straights. Trust me, I'm not proud of it, but for $450 total (parts + labor), the top-end gains were worth it:



    Now that your eyes have been hurt, there are some interesting things to note about doing a 2-cat delete downpipe setup.

    1) My setup is definitely custom: you can see that the S-bend is almost entirely removed. This reduces pipe length and restriction, and my exhaust guy felt that the mounts were sufficiently stiff enough that the 3/4" clearance I had with the chassis would never be a problem. So far, he's proven correct. You'll also notice that one side is actually further out than the other, and my exhaust guy got caught off guard after making two identical downpipes. I didn't even notice it at first, either, but looking at the factory ones also shows that the bends are slightly different on each side. Strange, because I didn't notice they weren't identical until I actually had the factory downpipes in my hands.

    2) The loss of low-end and mid-range torque is off-putting. However, over a few dozen miles, the ECU adjusts, and you find yourself getting used to the more linear pedal feel instead of that "quick" accelerating lurch that 99% of cars from the factory come like. It does make the pedal feel "heavy", though. Not physically, but engine-response wise.

    3) The gain in top-end power starts around 4K RPM, and combined with my catback and intakes, makes the 1-2 shift significantly harder to catch on the paddles/shifter. However, since every shift thereafter stays above 4K RPM, the increase in pull at this range is incredible and could easily equate to 400HP. I plan on getting a "baseline" dyno before I move forward with more aggressive mods like the chip and ECU tune I have planned.

    4) Your engine and exhaust will become significantly louder. I noticed more growl in my exhaust, and resonance points are significantly more of a rumble than a vibration. The engine at full throttle is signficantly louder, too, as you're generating a lot less backpressure and a lot more pipe noise just underneath the firewall.

    All-in-all? A downpipe + 2-cat delete brings out some power for sure. It makes your car growl more and pulls noticeably harder above 4K RPMs.

    And no, I don't have any jokes for this 2-meow neutering mod.
    Last edited by ZyroXZ2; 08-02-2018 at 12:19 PM.

  2. #2
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    Staff Team 344 Rep Points robz32's Avatar
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    are there supposed to be photos of the install? Just curious since you mentioned our eyes being hurt.

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    I don't think it looks bad, what cat-back are you running?
    Deep Chroma Blue GT2 RWD
    Engine: JB4 - HKS M40iL - VT Snorkels - Snow WMI - K&N Drop-in - Radium OCC x2
    Exterior: Maxton V2 Lip & Side Skirts
    Interior: Aluminum Shifter Extension
    Suspension: Neotech NVH Coilovers
    Brakes: Neotech - 6p Front 380x34 - 4p Rear 370x28
    Wheels: ACE Alloy AFF02 Black Chrome - Front 20x9 +32 - Rear 20x10.5 +50
    Tires: Firehawk Indy 500 - Front 255/35/20 - Rear 295/30/20

  4. #4
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    Quote Originally Posted by robz32 View Post
    are there supposed to be photos of the install? Just curious since you mentioned our eyes being hurt.
    Uhhh, that's weird, the photo got removed... Let me try to re-attach it. It was there, though, I swear... O.o

    Quote Originally Posted by STINGER View Post
    I don't think it looks bad, what cat-back are you running?
    Per my first major thread, Magnaflow, lol

  5. #5
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    Now it is there. It doesn't look as bad as you make it seem. Hardly anyone looks under there anyways.

    Looking forward to some sound clips.

  6. #6
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    I still can't see pictures...
    Current: '15 Genesis HTRAC w/Sig&Tech - CBW "Pearl"
    Prior Gems: '08 C6 Z51, '07 300 SRT8, '94 Impala SS
    Fuelly (MPG): http://www.fuelly.com/car/hyundai/ge...15/ssl1/741060

  7. #7
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    Quote Originally Posted by robz32 View Post
    Now it is there. It doesn't look as bad as you make it seem. Hardly anyone looks under there anyways.

    Looking forward to some sound clips.
    There won't be any for the downpipe. I do plan on getting a baseline dyno done in the not-too-distant future, and I'll be recording it for sound clips, of course

    Quote Originally Posted by Stingin' Away View Post
    I still can't see pictures...
    The picture is definitely there...

 

 
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