[radz28]

Looks AWESOME!!! Congrats' on the BG.

I think CSP saw 20-30 WHP going from the standard to the BG at around your power level. it was in one of his ZL1 build videos. It's not wasted money.

Love all the great pics. Clean work on the car, too.

[SOCAL.M6.ZLE]

Originally Posted by radz28

Looks AWESOME!!! Congrats' on the BG.

I think CSP saw 20-30 WHP going from the standard to the BG at around your power level. it was in one of his ZL1 build videos. It's not wasted money.

Love all the great pics. Clean work on the car, too.

Thanks for the feedback! I have a hard time understanding how it can make any more power with the same size filter element... and TB, but the elbow is absolutely larger! So, if it picked up 20rwhp, I would be more than happy and surprised at the same time Eager to see what changes with this and the larger UHO 4.5" cats...

If I can, id also like to swap out the cats to off road pipes during a cool down session, to see the difference there also.

Stay tuned

[radz28]

Originally Posted by SOCAL.M6.ZLE

Thanks for the feedback! I have a hard time understanding how it can make any more power with the same size filter element... and TB, but the elbow is absolutely larger! So, if it picked up 20rwhp, I would be more than happy and surprised at the same time Eager to see what changes with this and the larger UHO 4.5" cats...

If I can, id also like to swap out the cats to off road pipes during a cool down session, to see the difference there also.

Stay tuned

Larger tube, in general, and probably for the turn ahead of the RB are probably the biggest factors I'd guess, but I'm no engineer.

[RobZL1]

You got it. Friction and flow factors for the tube.

[SOCAL.M6.ZLE]

Well... it is a little early but I wanted to share a quick 4-way comparison.
It compares;

A: My most recent Dyno in March (fixed some belt slip)
B: No Cats (that didnt last long)
C: After upgrading to the GESI 4.5" UHO Cats
D: 3rd Data Log with the BIG GULP

Like ROB and others have pointed out, looks like the larger elbow is making a difference. Almost as much as the upgrade to the UHO cats!
Clearly the "standard" blower port is not breathing as good as the Xport (may need to upgrade soon)



Thoughts?

[RobZL1]

Any chance you have a sound clip of the new setup? I finally put on my CSP headers and UHO cats over the holiday weekend. It is no louder than stock in my opinion (other than the intrinsic headers noises you get inside the cabin with the windows up).

I'm used to my 5th gen ZL1 that was catless into the stock NPP, and that thing would wake the dead.

I'm looking for something more along those lines, but maybe not quite that ridiculous.

So... any clips or impressions or your new volume level with cats and catback? I think you noted it was maybe 75% of the catless sound?

Edit: unrelated side note- I also put in the BMR MM's. Those are awesome! I agree with your notes about the feel of the clutch improving. And no extra shake or anything, either.

[SOCAL.M6.ZLE]

Originally Posted by RobZL1

Any chance you have a sound clip of the new setup? I finally put on my CSP headers and UHO cats over the holiday weekend. It is no louder than stock in my opinion (other than the intrinsic headers noises you get inside the cabin with the windows up).

I'm used to my 5th gen ZL1 that was catless into the stock NPP, and that thing would wake the dead.

I'm looking for something more along those lines, but maybe not quite that ridiculous.

So... any clips or impressions or your new volume level with cats and catback? I think you noted it was maybe 75% of the catless sound?

Edit: unrelated side note- I also put in the BMR MM's. Those are awesome! I agree with your notes about the feel of the clutch improving. And no extra shake or anything, either.

Hey Rob,

PM me your cell, and I text you a few videos...

As for the exhaust... the UHO cats really help partial and WOT volume and tone. The only place I wish I have more volume is idle.

I agree on the BMR MM's... what an improvement. I remember being surprised on how much more responsive the engine felt.