IHRA Pure Stock legal muffler suggestions

Eric Merryfield · 09-14-2010, 10:03 AM

Best flowing?

Flowmaster 40's? Hookers? dynomax ultra welded?

Currently I have dynomax street legal mufflers on the car.

For a 70-71 challenger 383 car that might be too slow for Stock eliminator in the NHRA and has everything else that pure stock requires....ie stock valve springs, stock 4 wheel drums and with a cam change, a fuel pump, water pump would be good to go!

Myron Piatek · 09-14-2010, 12:08 PM

I have TTI 1 5/8"/1 3/4" step headers with their 3" X-pipe and Dynomax Ultraflo mufflers ending at the rear end housing on my car. Every indication was that I picked up ET with the combo, especially after removing the extra 60 lbs from elsewhere in the car to get back down to minimum and playing with the jetting. I might try their bullet-style in the future. But I'm not sure exactly what is legal for Pure Stock without looking it up.

This is going from open header with collector extensions which I ran for a couple of years before adding the exhaust system.

*** Oops! Just got home and looked up the rules - no straight-through mufflers in Pure Stock.
But the X-pipe should be worth looking into.

Tony Curcio · 09-14-2010, 09:01 PM

I once did a back to back comparison between Flowmasters and open headers on a D/PS Camaro.

It slowed .02, but we did not adjust the weight- it crossed the scales 20 lbs heavier, so it looks like a wash.

greg fulk · 09-15-2010, 01:40 AM

Flowmaster 40's ...that's what we have on Dad's H/PS Mustang.

09-14-2010, 10:03 AM	#1
Eric Merryfield Senior Member Join Date: Apr 2008 Posts: 847 Likes: 1 Liked 471 Times in 114 Posts	IHRA Pure Stock legal muffler suggestions Best flowing? Flowmaster 40's? Hookers? dynomax ultra welded? Currently I have dynomax street legal mufflers on the car. For a 70-71 challenger 383 car that might be too slow for Stock eliminator in the NHRA and has everything else that pure stock requires....ie stock valve springs, stock 4 wheel drums and with a cam change, a fuel pump, water pump would be good to go! __________________ Eric Merryfield 1883 STK

09-14-2010, 12:08 PM	#2
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,538 Likes: 34 Liked 132 Times in 48 Posts	Re: IHRA Pure Stock legal muffler suggestions I have TTI 1 5/8"/1 3/4" step headers with their 3" X-pipe and Dynomax Ultraflo mufflers ending at the rear end housing on my car. Every indication was that I picked up ET with the combo, especially after removing the extra 60 lbs from elsewhere in the car to get back down to minimum and playing with the jetting. I might try their bullet-style in the future. But I'm not sure exactly what is legal for Pure Stock without looking it up. This is going from open header with collector extensions which I ran for a couple of years before adding the exhaust system. *** Oops! Just got home and looked up the rules - no straight-through mufflers in Pure Stock. But the X-pipe should be worth looking into. Last edited by Myron Piatek; 09-14-2010 at 04:00 PM.

09-14-2010, 09:01 PM	#3
Tony Curcio Member Join Date: Mar 2002 Location: West Chester, PA Posts: 271 Likes: 1 Liked 4 Times in 1 Post	Re: IHRA Pure Stock legal muffler suggestions I once did a back to back comparison between Flowmasters and open headers on a D/PS Camaro. It slowed .02, but we did not adjust the weight- it crossed the scales 20 lbs heavier, so it looks like a wash. __________________ Tony Curcio 1860 STK

09-15-2010, 01:40 AM	#4
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: IHRA Pure Stock legal muffler suggestions Flowmaster 40's ...that's what we have on Dad's H/PS Mustang. __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"