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#1
08-06-2008, 11:19 AM
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i'm on my second set of 3.5" ultraflows with x pipe in a ten year period.went from 3.5 flowmaster top ten shootout mufflers. ultra flows are quieter and performance picked up at the track. like 4mula71 said no resonance and nice cruising.
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#2
08-06-2008, 09:23 PM
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Thanks guys! I will be running these, question is either of you running 3.5 dual oval exhaust? curious how to adapt the oval to round muffler
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D.S.R.E. Your NW Pontiac Street/Strip Engine Builder, Specializing in Cylinder Head,Intake Manifold,and Exhaust Manifold Porting services and Building the Most Efficient stock rebuilds to Hi HP Pump Gas and Race Combinations for Pontiac,Buicks,Olds,FE Fords,385 Series and HP Gen 3 and 4 LS engines! 2006 silvy Z71 4X4,383 LS 600+hp NA Shared Toy-66 Lemans 470cid by me 537hp 580tq-manifolds, 570hp 590tq-2"headers,custom cam,rpm intake, mild e-heads, Looks stock ;-} |
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#3
08-06-2008, 09:36 PM
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I run the 3" inlet/outlet welded UltraFlows and they have a more mellow sound than 40 series. Also have the X crossover and 2.5" tailpipes. Slight drone around 2000rpm. Not a problem. I've run 11.32@119 through full exhaust with 4000# wagon.
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