SHOULD I UPGRADE MY EXHAUST?

Discussion in 'High Performance Modifications' started by Z28-79, Jul 22, 2019.

  1. Z28zz383

    Z28zz383 Veteran Member

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    I have been running the pypes 2.5 transverse for several years. Their mandrel bent X pipe system is the "go to" for easy clean install and good clearance. I have no regrets. If planning to go up to over 450 hp, a 3'' system might be a good upgrade. Or use the pypes elec. cut outs for when you need more flow. I wanted a good sounding system, but still be able to enjoy the ride and stereo. Pypes has delivered. No drone!
     
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  2. G72Zed

    G72Zed Veteran Member

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    Yep, it's a choke point for sure, on both points, pipe size, and most likely those "glasspacks". A nice 2.5" mandrel bent exhaust/kit could support up to 500hp, mufflers need to flow in the 550 CFM range each at that HP (assuming dual) for a close to "zero HP" loss system.

    If your getting a muffler shop to build it with compression bends, go 3".
     
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  3. 1980RS

    1980RS Veteran Member

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    Not true bout going from 2.5 to 3" exhaust. I have both systems for my street car and the 2.5"feels stronger the 3". Remember exhaust is different than the intake side, just like headers bigger is not better for exhaust. I have had 1 5/8" headers that makes more power than the big buck Hooker Super Comps, and these are the cheapo ones. You might loose maybe 10hp but if your system is 2.5 mandrel bent with some real good flowing mufflers that about the drop I would expect but the torque numbers will be pretty good. Look for the Engine masters video on mufflers and exhaust, it was pretty eye opening.
     
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  4. 77 cruiser

    77 cruiser Veteran Member

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    Especially the smashed header tests.
     
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  5. John Wright

    John Wright Veteran Member Lifetime Gold Member

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    I used Pypes 3" mandrel bent Stainless steel X system, over the axle and out the back with the factory style hockey stick tips. Works great, I modified it some for my single turbo car but for a stock arrangement, it should work great.
     
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  6. nova75mike

    nova75mike Veteran Member

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    x2 on the 3" Pypes system with X pipe and Race Pro's. looks very nice and with the help of a buddy, was installed in about an hour. was worried about it fitting around the sway bar, but had PLENTY of clearance.
     
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  7. 1980RS

    1980RS Veteran Member

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    That was my favorite video too.
     
  8. John Wright

    John Wright Veteran Member Lifetime Gold Member

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    I remember that video, it amazed me how much they smashed on those header tubes before the power was effected. It made me feel a little better about denting the headers for socket clearance for the header bolts.
     
  9. Bandit723

    Bandit723 Veteran Member

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    Well here is muffler shop done pipes vs internet mandrel bent pypes. Not sure what a few krinkles in the tubes makes performance wise but i did measure both the bent pipes vs the mandrel bent ones they are the same. Down side is the pypes stuff leaks really bad and did not fit all that well. I am sure it can be plugged up but is it worth your time. Upside the shop tail pipes run out the back of the car fully "no fumes into the trunk" and clears the gas tank and body with room to spare. No rattles at all...
    20190518_102334.jpg 20190518_132413.jpg
     
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  10. G72Zed

    G72Zed Veteran Member

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    Look for the Engine masters video on mufflers and exhaust, it was pretty eye opening.

    I also found it very interesting, maybe taking "time" like 10-12 seconds to hit the target RPM with a 300 RPM/sec sweep somewhat camouflages or screws the data.

    Static Dyno data vs Dynamic results can be on opposite sides of the scale.

    Would be interesting if they did the same test within 10 seconds hitting the sweeps 3 or 4 times to max rpm simulating a 3 spd auto or 4 spd 10 second 1/4 pass. One of the fancy dynos at BLP or Hendricks would be interesting, measuring "time" instead of HP/TQ may uncover something, not to mention the cyl to cyl variations.
     

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