06murder

Is true dual x pipe on 5.3 good or bad what your opinion, I bought the speed engineering exhaust but the muffler is ******* heavy! I had off road y pipe and borla muffler with turn down, my track time just seem as it wasn’t mph’ing like it should! Crammed 5.3 bolt on, on spray 200+

DMarts10

iTrader: (1)

What was your mph? I was running a lq4 with a tps 224/224 cam, bolt ons, with pacesetter long tubes, speed engineering true duals with x pipe, and a 150 shot. Oh yeah and it’s a rcsb w 4l80 and 14bolt with 4.10. Et was 11.79 @ 115mph

06murder

Before 7.13 at 94.44

DMarts10

iTrader: (1)

Got me by a few. Just put in an Ls1 with a bigger cam and 200 shot. I’ll report back what I run but those numbers are quick.

06murder

It shock the **** out of me I promise you that! And that was on stock 78mm tb with tbss intake and off road y pipe and stock intermediate pipe with borla muffler, it has ls3 tb with tbss intake speed engineering x pipe, I just ran it on the street on motor with the 250 tune on the dragy ran 8.78 😎

06murder

My goal is 6.6’s 6.7’s on 250

adriver

iTrader: (1)

Are you saying, You WERE using an ORY pipe (with long tubes), and now you are not? What is it now?

06murder

Speed engineering x pipe

adriver

iTrader: (1)

I really don't think the weight could have made a big difference. I can tell the difference between half a tank when I drive, but that's about 130 pounds, and you shouldn't have picked up more than 50 or 60 pounds. I could only guess that's on the high side.

I bought a speed engineering set of short tubes because of how cheap they were. When I got em, the flange was uneven, and they were so light, I swear they might be 20gauge steel, when EVERY other pair is 16 or at least 18g. That speed engineering stuff is about as cheap as it gets.

I think it was on roadkill they showed two different thrush mufflers that had the exact same exhaust body, and all they do is weld on different size pipes on the end to make 2.5", and 3" mufflers. They both had the same ID on the tubing to housing. I wouldn't put it past speed engineering to be the same way. Dual 3" should be much bigger than what you need. If it's not all welded up, you might want to measure the actual ID of the inlet and exhaust on that muffler. You might be choking it now after "going bigger".