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Doug thorley tri-y's

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Old 01-28-2012, 02:30 PM
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Ahhhhh ok well that makes it easier than 1500 to keep the stock cat location than. Good to know
Old 02-25-2012, 06:22 AM
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Anyone have an update on power with these headers. I ordered a pair of 3353-3 thorley headers today brand new off eBay for 350 shipped. I couldn't pass it up. Anyone know a good dyno place in southern Cali. Riverside, Ontario, Anaheim. Anywhere in between there. Maybe a place that does dyno tunes as well.
Old 02-27-2012, 11:38 PM
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Please post some before and after dyno runs if you can. I know RET and CMS have dynos.
Old 02-29-2012, 01:52 PM
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Originally Posted by Silverado2469
Anyone have an update on power with these headers. I ordered a pair of 3353-3 thorley headers today brand new off eBay for 350 shipped. I couldn't pass it up. Anyone know a good dyno place in southern Cali. Riverside, Ontario, Anaheim. Anywhere in between there. Maybe a place that does dyno tunes as well.
CBM Motorsports in Rancho Cucamonga. They do dyno tunes.
Old 04-09-2012, 01:43 PM
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I thought the tri-y's were 310y.
Old 04-09-2012, 01:46 PM
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I have Thorley Tri-ys on my 2000 and they seem to work well. I just bought an '06 and it feels way under-powered compared to the old truck. I didn't realise they made that much difference but I can really feel it.

Last edited by lowburb; 04-10-2012 at 09:20 PM.
Old 04-09-2012, 02:08 PM
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would these work/be CA legal on an '06?

I have Gibson shorties and they make the truck sound healthier, but didnt make much of a power difference.
Old 04-09-2012, 03:13 PM
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Originally Posted by Silverado2469
Anyone have an update on power with these headers. I ordered a pair of 3353-3 thorley headers today brand new off eBay for 350 shipped. I couldn't pass it up. Anyone know a good dyno place in southern Cali. Riverside, Ontario, Anaheim. Anywhere in between there. Maybe a place that does dyno tunes as well.
I think these are Doug's Headers not Doug Thorley Tri-ys

http://www.summitracing.com/parts/DOU-D3353-3/?rtype=10
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