What size OD for cutout? 3" or 3.5"

justinp95

Member
Joined
Feb 16, 2011
Posts
63
Reaction score
0
Location
TX
I wanted to install an electric cutout, but what size would be best? 3" or 3.5"? I THINK the exhaust size is 3.5", not completely sure. Thanks
 

Dantheman1540

Full Access Member
Joined
Feb 13, 2020
Posts
4,456
Reaction score
9,618
Location
Sugar Loaf Mountain
3" is probably fine unless your engine makes a crazy amount of power. My single 3" cutout sounds pretty wild at idle and absolutely savage at WOT.
 

iamdub

Full Access Member
Joined
Apr 23, 2016
Posts
16,788
Reaction score
31,609
Location
Li'l Weezyana
I wanted to install an electric cutout, but what size would be best? 3" or 3.5"? I THINK the exhaust size is 3.5", not completely sure. Thanks

Pretty sure the stock size after it merges into a single pipe is 3.5". For a cutout on a Denali, 3" will be fine unless you're doing it for all-out power at 5,000+ RPM for track duty. I have a feeling you're wanting it for sound, and the 3" will be plenty for that.
 

Ghost10

Supporting Member
Joined
Feb 16, 2017
Posts
475
Reaction score
164
Pretty sure the stock size after it merges into a single pipe is 3.5". For a cutout on a Denali, 3" will be fine unless you're doing it for all-out power at 5,000+ RPM for track duty. I have a feeling you're wanting it for sound, and the 3" will be plenty for that.
do you have a recommendation for a Sheep cut out electronic and expensive cut out?
 

iamdub

Full Access Member
Joined
Apr 23, 2016
Posts
16,788
Reaction score
31,609
Location
Li'l Weezyana
do you have a recommendation for a Sheep cut out electronic and expensive cut out?

I've found that you get what you pay for. For the cheap ones, they're pretty much all the same Chinese junk and you can just take your pick. The expensive ones (Quicktime, Doug's Headers, etc.) are known to seal better and have better quality motor drives, especially the Doug's due to the design. For the cheaper ones, replacement motor/gear drives are cheap and easy to swap. They're just repurposed power window drives.

If it were me, I'd get a standard 3" DIY cutout mount (like this) and weld that to the stock 3.5" pipe. This would eliminate cutting out a section of the stock pipe and welding in a smaller diameter section (unless you bought a 3.5" cutout Y). Then, you could bolt on whatever 3" electric cutout (more common and cheaper size than 3.5") you want. If it fails, Amazon Prime or eBay yourself another $30-$50 one.
 

Forum statistics

Threads
119,449
Posts
1,646,564
Members
80,585
Latest member
ydinger
Top