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  1. Y

    2 inch exhaust with 300+ hp 5.7

    So I just shipped back the magnaflow cat system and went to the muffler shop for an estimate. $750 from LT headers into the dual in muffler. Stainless 2.5 inch pipe with two high flow cats.
  2. Y

    2 inch exhaust with 300+ hp 5.7

    Yeah, that Magnaflow 2” kit sitting in my garage is looking more attractive right now
  3. Y

    2 inch exhaust with 300+ hp 5.7

    Well just checked header back kits. All are 2.25 inches...
  4. Y

    2 inch exhaust with 300+ hp 5.7

    So you get a 2.75 inch pipe but it is choked at the manifold. Makes no sense!!! I wonder if I get those pacesetter LTs if I should get that 1 ton cat system anyway or just build my own with a header back kit and two high flows cats
  5. Y

    2 inch exhaust with 300+ hp 5.7

    So that leads to another question, what diameter is the 5.7 K1500 exhaust manifold? Are they also bigger on the K3500s and Express vans?
  6. Y

    2 inch exhaust with 300+ hp 5.7

    Ok, just realised I need to be looking at K3500 trucks. Just need to check the front (Walker 50454) and back (Walker 50316) parts will fit under my stubby 2 door Yukon.... if they do I'm good, but the cost is getting closer to a custom exhaust. Supercharged111, I will check the U-pulls if they...
  7. Y

    2 inch exhaust with 300+ hp 5.7

    Just called Walker for the K2500 cat system part 50410. they are 2" WTF?
  8. Y

    2 inch exhaust with 300+ hp 5.7

    Any chance you have a part number for those? I looked at Rockauto and there a re a bunch by Walker and another made by Borsal, but no pipe sizes are listed. should I assume they are all 2.5?
  9. Y

    2 inch exhaust with 300+ hp 5.7

    Nobody posts what size their pipes are, I have been looking through rockauto at K2500 cat kits and its all a guess... Maybe the jegs off road can be used, and then weld in some highflow cats?
  10. Y

    Change exhaust from dual cats to single?

    This is exactly what I am thinking of doing. How did it work out?
  11. Y

    2 inch exhaust with 300+ hp 5.7

    Thanks for all your replies! So yeah it is heading back. I do want to keep cats and all my 4 sensors. I already have a big magnaflow muffler with 2.5 dual in and 3 inch out. I’d like to keep that. I was also trying to avoid a custom exhaust due to the high cost. Suggestions are welcome! Thanks
  12. Y

    2 inch exhaust with 300+ hp 5.7

    Hi Everyone, posting this question here as well as the tahoeyukon forum. Is anyone running 300+ hp through 2 inch down pipes? I have a 97 Yukon with the MPFI upgrade and just recently the 0411 pcm with the Vortec express van tune. what a difference that made! increased mpg by 3 and the engine...
  13. Y

    Which GM cam to perfect the L31?

    Ok, I guess I am jacking this post sorry, I will start another one.
  14. Y

    What cam for single cab 2WDshortbed with new L31R

    Question on the Ls6 springs, is the seat pressure ok for the 151 cam?
  15. Y

    Which GM cam to perfect the L31?

    Hi All, I have a chance to get a deal in the 151 cam, but was planning on a 395. The dyno chart I see on the 151 doesn't show off idle performance. Is it similar or better than 395 for torque? This is an occasional boat tow and fun driver. Mpg is important. I have the delphi spider bigger...
  16. Y

    What cam for single cab 2WDshortbed with new L31R

    Following this thread as I am planning a cam swap as well. It seems risky keeping stock springs with that .474 lift. I would definitely put the LS6 behives in there. Seems like a great cam choice though!
  17. Y

    Rebuild or Replace 4l60??

    I agree with your choice to rebuild. The amount of work, money, and added weight of a 4L80e needs to really be worth it.
  18. Y

    Tire Poll

    I have the KO2s on mine and they are really great. Very quiet on the highway and excellent in snow.
  19. Y

    Heater Hose Quick Disconnect to Barbed Fitting and Hose Clamp Swap/Fix

    If you do break connector, like most, buy an extra hose fitting and make a tap out of it with a grinder. Cut 3 in slots in the broken fitting with a hacksaw blade. Then chip away at it with a pointed punch. Once you get most of it out, run the home made tap in and out gradually cleaning it...
  20. Y

    Bought a 97 two door Yukon and love it!

    Here it is when I first got it. I bought some 285 BFG KO2s and plasti dipped the wheels. Now it looks like this. The engine bay smelled like coolant. I researched that and found out about the manifold gasket problem. I'm currently finishing that job as well as the MPFI upgrade. Will...

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