New Exhaust System

I mean thats why I asked. if its a needed option then why is it even an option to get it without?

 

the o2 option is for the additional sensor for the afr gauges we run being supercharged. This is not needed if you you’re not supercharged.

 

This is what I figured it was for- thank you

 

Ask me since I helped make this system lol

 

And...I thought it was just for Secondary O2's.
@reywcms is in the know!

 

I asked this question too and the answer was you can do it without a lift if you don’t mind cutting the factory midpipes. If you want them in one piece you need a lift, which is why I haven’t done them myself yet. They’re getting put on this week finally.

 

Got the truck back with the SPD midpipes and currently has the DD TRD replacement system with an X pipe, 16” mufflers and resonators. It is insane how much louder it is. It sounds pretty amazing, I just hope it’s tolerable when towing. Sounds very similar to the full SPD setup from what I can tell. I’ll have to get a better video asap. When I have time I’d like to swap in the TRD duals for comparison. Very pleased though! No CELs so far and no bad exhaust odor, just the odor from the new pipes with the oily residue burning off. Idle sounds quiet with a bit more burble, and a way better sound at startup. Light throttle isn’t much different at all, but start putting it under any kind of load and it gets way louder very fast. It’s fun to have the sound finally match how quickly it moves. One sad note as mentioned by others, the SC whine is harder to hear now. A quick video of rolling into the throttle, not going too crazy. https://vimeo.com/1026724322

 

nice! im swapping my carven Rs to carven TRs

 

Gonna see if I can come up with some type of exit for this system. Worst case I use this to build the exhaust for my k5 crawler.

 

Two 45’s are about perfect. Got two more delivering tomorrow.

 

Got a better revving video.

https://vimeo.com/1028519828

 

Sounds damn good!

 

Cold start this morning. https://youtu.be/zHKBbD2PrTw?si=IHlQlM7IrT2aHdgz

 

The midpipes are definitely key to unleashing the beast as far as sound on these trucks.

 

What the hell was that knock right when it fired after you hit the key?

 

I had just finished towing my camper home on a long trip and it was good and hot. Lately when it’s hot the truck starts nearly as soon as it starts cranking and it occasionally makes that sound. Ironically the polar opposite of the extended crank start I used to have on occasion. It may even be the starter gear disengaging.

 

My 45's just showed up. Looks like it'll be perfect. Gonna clamp everything together and see how it does and then order a couple of tips to bring it fully out past the fender.

 

Proof of concept right here. Initial start up and rev’s show it’s gotten the sound outside and not inside. If this works I’ll weld it up and make them even and get some tips on there. They look low but they are about an inch and a half below the fender. It looks like with some finesse from a hammer I can get them a bit higher.

 

The reason that I ask, is that my truck was doing the same thing when I was having all that trouble with the 750cc FiveO injectors that were giving me extended cranks. It wouldn't do it with any other injectors. I even made a video of it. I'll see if I can scratch it up . . .

Edit:
I found it, I'll upload it to YT and post the link this evening.

 

your springs go under the axel?

 

Yes, with shocks through the bed. Actually moving to larger rear shocks, and bump stops along with reworking the bedcage.

 

Got them tacked up. Didn’t come out as level as I wanted but look ok. Should be able to weld them up tomorrow and see how it works.

 

Nice. So no difference in sound with this setup vs without the tailpipes?

 

Sound wise not at all. Pipes are all still equal length give or take an inch. I emailed SPD about it and they said the equal length only matters prior to the merge at the x-pipe. I’m just trying to get the volume down in the cab. It’s not bad but towing uphill or cruising at 85mph and it can get loud. Also, I like to tinker.

 

I know that we're going off on a tangent here, but here's what my starts were sounding like. But as mentioned, it was only with that one set of injectors.

https://youtu.be/1YydjiBf8SA

 

New hypothesis… maybe a fuel injector leaking down while the truck is off. If started quickly enough after shut down not enough fuel has leaked to cause the knock, and contrary if you wait long enough it has enough time to evaporate. Start in that 10-20 minute window and there is a puddle of fuel that causes that knock at startup.

 

Weelll, mine was doing it for every hot start. Either way, I sent them back and was sent a replacement set, which also gave me the irritating long/rich cranks. The replacements also gave me the long/rich cranks, but as soon as I discovered that, I removed them as well. They weren't installed long enough to determine if there was a cranking knock. I had had enough of dealing with that crap.

 

Did the tailpipes help any with the volume?

 

Mostly. Right about 1800rpm it gets loud inside but still the same 80db level it was before. Above or below that it’s dead quiet.

 

If it's not tolerable a 25-26 inch hemholtz resonator could help.