That's right, I read that. Sorry for the repeat. I have been searching the internet, and can find no reviews, nor videos featuring the Pacesetter Shorties. Everywhere that sells them, no reviews are present. I guess NO ONE with a computer/phone has used them, or no one wants to say so... scary... I don't want to be the guinea pig for the entire automotive world... May go with the JBA's like you, @kbuskill . At least I know what I'll be getting...
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
- Thread starter phattyford
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
That's right, I read that. Sorry for the repeat. I have been searching the internet, and can find no reviews, nor videos featuring the Pacesetter Shorties. Everywhere that sells them, no reviews are present. I guess NO ONE with a computer/phone has used them, or no one wants to say so... scary... I don't want to be the guinea pig for the entire automotive world... May go with the JBA's like you, @kbuskill . At least I know what I'll be getting...
Ilikemtb999
Full Access Member
I’d think as an aerospace engineer, Paul would provide spring clamps not work clamps. The Y’s look great though
Last edited:
anyone know anything about BBK?
https://www.amazon.com/BBK-40050-Pe...-4&vehicleName=2007+GMC+Yukon#customerReviews
https://www.amazon.com/BBK-40050-Pe...-4&vehicleName=2007+GMC+Yukon#customerReviews
kbuskill
***CAUTION*** I do my own stunts!
They are 1 3/4" primary tube VS the JBA 1 5/8" primary tube.
The smaller the pipe, the faster the hot gases will flow out.
The larger the pipe, the slower the hot gases will flow out.
The smaller pipe cannot flow as much volume but it will scavenge better due to the gases moving faster.
The larger pipe will flow more volume but at slower speeds which will reduce the scavenging and not produce as much power down low.
With exhaust, and headers especially, it's about keeping the gases hot and moving as fast as possible.
Hot gases expand and flow faster than cold gases.
You don't want "back pressure" but you also don't want a huge wide open pipe because when the hot gases leave the head they will expand to fill the larger pipe which will slow them down which kills the scavenging.
You want the hot gases to escape into a smaller pipe so that less expansion takes place and the gases will maintain there velocity/momentum and create more of a vacuum effect on the other cylinders... = scavenging.
A naturally aspirated 5.3L doesn't need anything bigger than 1 5/8" header.
iamdub
Full Access Member
Interesting. Apparently, I've always overlooked that.
iamdub
Full Access Member
From everything I've read, they're a good blend of both styles. It's how NASCAR headers are, except they're tuned for power in a narrow RPM band for obvious reasons. When I can't swing one way or the other, I tend to aim for right down the middle. Although, with the low-RPM torque benefits of shorties, there may be more mid- and upper- RPM gains to be had by deleting the cats. Seems to me this would be a close second to tri-Ys.
iamdub
Full Access Member
I take that back, you can see part of the bottom of it behind the rear tire if you know what to look for, but not enough for me to spend any time worrying about it... Lol
2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18
That's not very obtrusive at all. For us with the 5.3, the exhaust exits out the side, making the side of that giant can really visible from the back.
Check’s in the mail.@Rocketman , I would love to do these. It's just not financially feasible for me, especially if I'm going to do the Cam and AFM delete. Now, if you'd like to make a significant donation to the cause, I'm all in!
iamdub
Full Access Member
Check’s in the mail.
Had to Google "check". *sigh* You're one of THOSE.
I guess you holding up the line at the grocery store as you fill out your check is still way faster than you counting out your change to the cashier.
