How much HP 2.5 exhaust?

[Bat Maro]

Originally Posted by thahemp

Sure it is. A 3" sounds like heaven on these cars.

+1

my 3" stainless works retro chambered exhaust sounds freakin amazing

[MrWray]

Im running a modified setup using the stock exhaust, Doug Thorley 1 3/4" Tri Y headers, mid pipes "no cats", deleted the resonator "replaced with straight pipe", and replaced the stock suitcases with flowmaster super 10 race mufflers. Sounds great and shed quite a bit of weight

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[Bo White]

I put down 570 through the stock cat back with muffler delete. I put a 3" cat back on and will go back to the dyno soon.

[Chevrolade]

Originally Posted by Sales@JDP

Thanks for the order! You'll have to post up a sound clip and let us know how you like it!

Best regards,

Tyler
888-308-6007

I sure will Tyler thanks again for the great deal.

[the rich dude]

I'd really like to know what the "pro's" think on how much HP a 2.5" cat back is good for? In planning on running either kooks 1 7/8 headers or LG headers. With either high flow cats or off road pipe. Was thinking I would just run a 3" exhaust from either kooks or LG but I'm really loving the sound of the magnaflow 16580 but it only comes in a 2.5" exhaust. I'm planning on making 750rwhp. Think this exhaust will be ok or will it be to restrictive?

[the rich dude]

is this not the most bad A$$ sounding car?

[grocerygetter]

Sounds familiar... I have no cats and a dual 2.5 magnaflow with cam and vortech.

[the rich dude]

Originally Posted by grocerygetter

Sounds familiar... I have no cats and a dual 2.5 magnaflow with cam and vortech.

I'd love to hear what yours sounds like with no cats!!! Video please!!

[grocerygetter]

My iPhone sucks on audio.

[Bo White]

Put your ear buds in. Night and day on my phone and my buddy's.

[MrWray]

I made a video of my exhaust but its so loud that my phone speaker cancels out alot of the sound to where its really distorted. Even with ear buds in its distorted.

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[BlaqWhole]

Question: Does anyone have a video or a link to a thread that shows before and after dyno testing of a 2.5 > 3 inch exhaust? Because I keep reading people say that it doesn't make a difference. But I have yet to see any hard evidence. Its like someone one day decided to say this and it just caught on.

Having said that, I personally would not use any 2.5 inch exhaust on any application producing more than 500 whp. I don't think a dual 2.5 inch exhaust is enough at that point. You might be able to make X amount of power, but I think upping to a 3 inch at that point would provide worhtwhile gains. But still, I'd like to see some dyno results because word of mouth isn't enough for me...no offense anyone.

[Iam Broke]

I went from a 3" MBRP (no bottleneck at the headers, custom full 3") back down to a 2.5" Solo Mach XL to eliminate the deafening drone. While no dyno was done, my 60-100 mph time remained the same at 3.7x seconds (logged with HPTuners scanner) and no boost increase. I'm someplace north of 600 whp at 9 psi.

[VADER SS L99]

Originally Posted by Iam Broke

I went from a 3" MBRP (no bottleneck at the headers, custom full 3") back down to a 2.5" Solo Mach XL to eliminate the deafening drone. While no dyno was done, my 60-100 mph time remained the same at 3.7x seconds (logged with HPTuners scanner) and no boost increase. I'm someplace north of 600 whp at 9 psi.

That's very interesting with that much power as I thought you would have lost some. It could be that the DA was high when you recorded the 3" but low when you recorded the 2.5".