I was wondering what kind of power gain is made by extrude honing the TPI pieces. I have the TPIS Big Mouth Base, SLP Runners, Plenum ported to the runners and TB. All my pieces HAVE been extrude honed but I haven't installed them yet. I would like to know what kind of gains are made by this extrude honing of after market TPI parts? Anyone have before and after dyno runs? Hard facts would be great

I bought these parts already done, but I know it is VERY expensive, probably as much as the pieces cost themselves.

 

I have some limited test data with extruded induction pieces (wanting more tests). So far what I have is 2.7% power increase between 2000 and 6000 rpm.
First thing I notice about ex-honing is that you don't get a big increase in peak power but still a significant increase through the entire RPM range of the engine. I would expect the percentage gain to go up a little more with rpms higher than 6000.

I really like it. It's nice to get a power increase (even a small one) that spans the entire rpm range with no negative effects.

ODB

 

You may see gains but wait until you get the bill for extrude honing, YIKES! BIG MONEY.

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Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

 

Yes I know it's expensive, glad mine came already done

That is great about the power increase across the entire RPM range. I can't wait to put this stuff on.