2018 Granatolli exhaust cutout install Thread.

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VibraSHO

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I will be installing the Granatelli exhaust cutouts on my 2018 non-pp today.

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These are the parts that were sent times 2. I like the switch idea if I could route them to one switch and I’d install this next to the traction control switch.
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I ordered the remote adapter as well, I will hook this to the 2 remaining slots on my garage door opener (home link) if the above method doesn’t work out.

I will look for a spot and update.

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Need about 10-11 inches of original pipe size. Good time to delete the cat? I could fit it between the cat and muffler with some modification. Anything before will be cutting into the PPE catted DPs. Thoughts??

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VibraSHO

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Figured I only need about 8 inches, not the 11 that I thought initially. Going to go between cat and muffler.


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VibraSHO

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Here is the picture of the cuts. Used a reciprocating saw to make the cuts, angle grinder to clean it up. I cut a bit short to make sure the cutout will fit. 3a193f90d596b4c5be57c7f3d54b25f1


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VibraSHO

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Driver’s side installed. Used a lightweight rubber mallet. Started with the muffler side, pushed in as close to the muffler as possible. Then I pushed the muffler and cat apart and slid it on. I used the rubber mallet on the ****** that is pictured to lightly tap it into place.
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There is about an eighth inch gap as shown, I cut too short. This gap is on each side, however, the clamp will cover this up nicely.
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Here is the passenger side cat. You can see how I had to use the grinder to clean up (not finished yet). I needed to grind at a slight angle to make a funnel shaped so that the pieces fit together properly. I had to do this on both the cat and muffler side.


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VibraSHO

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Note: don’t connect one before the other. Now I can’t get the passenger side in because the drivers side won’t come out. Connect both exhaust sides first, then work the cat side together.

Stupid mistake on my part.


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VibraSHO

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So I ended up dropping the cat. I recommend this as it takes 5 minutes and will make the instal easier. After the cuts of course it it actually drops down. It just swings down once you disconnect from the resonators.

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Here is a picture of both attached to the muffler side.


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VibraSHO

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Pretty easy from the last post to complete hookup. Here are the pics of it installed minus the door and wiring. I’ll finish that tomorrow.

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76FoMoCo

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Looking great. Not much for power gains but fun. Why not put them facing the other way?
Seems like you might have them mixed up side to side and 180*?
 
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CCXVI

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Looking great. Not much for power gains but fun. Why not put them facing the other way?
Seems like you might have them mixed up side to side and 180*?

Surprisingly it did make a little low end bump. One of the clay hills I used to drive up regularly I noticed it had less trouble with them open.

As fun as the dumps were I realized I had them open more often than not, and that's how I went with the driver door exit. I'm really thinking about another SHO in a bit and going with the vacuum actuated dumps this time.
 

VibraSHO

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Looking great. Not much for power gains but fun. Why not put them facing the other way?
Seems like you might have them mixed up side to side and 180*?

I figured it would be better for airflow, it has a straight path from the cat to the muffler. If I swapped them, it thought it may dump the majority of exhaust into the muffler, instead of into the cutout. My thought process was path of least resistance. I may have over thought that though.


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VibraSHO

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Surprisingly it did make a little low end bump. One of the clay hills I used to drive up regularly I noticed it had less trouble with them open.

As fun as the dumps were I realized I had them open more often than not, and that's how I went with the driver door exit. I'm really thinking about another SHO in a bit and going with the vacuum actuated dumps this time.

I could see myself driving with them open the majority of the time. Certainly been a fun mod to install and mess with. I’ll be back at it today with the wiring.


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CCXVI

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Tons of drone with it exiting under the car though. Great at anything except cruising. Idle/parking lots it sounds great, and flat out it's not really noticable, but on the highway or something it's pretty bad obviously.
 

VibraSHO

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Alright here I’m installing the gaskets to the exhaust ******. I ran the bolts front to rear.

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So the bolts screw into the “3-bolt exhaust ******” (pictured). The supplied nuts were not used. If I put the nuts on as well the clamp with tip would not fit.
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This is the clamp and tip I’m referring to.

I ended up using the lock washer at the beginning of the bolt between the bolt face and ******. Used lock-tight on all three bolts to be safe.
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Drivers side complete.

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Both sides in. Wiring is tricky for the passenger side. I’m working on wiring through the heat shield to connect the two on the drivers side.

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VibraSHO

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Tons of drone with it exiting under the car though. Great at anything except cruising. Idle/parking lots it sounds great, and flat out it's not really noticable, but on the highway or something it's pretty bad obviously.

I took it out last night prior to installing the remainder. The drone is wicked when I was cruising. I can’t even imagine how it would be on the highway at full open. I agree, it sounds really good at an idle.


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