[DSX_Camaro]

Originally Posted by ramil13

Ok great thats good to know. I already have a secondary cat delete so I've been told catless downpipes won't offer much of a performance increase compared to that.

I'm thinking of getting 3.45 gears... the change in gears gives more torque or just more responsive? From the looks of it the Vitesse controller doesn't do anything performance wise so I guess i won't go for that. From what people told me the difference between the 72mm and 80mm TB is about 2-4 HP so I didn't think it was worth paying an extra $200 for that...

I went from secondary deletes to catless and there's a pretty fair difference. I don't have dyno numbers but there was a definite power gain, more than I felt when I removed the secondary cats. I also don't know numbers for the stock vs 80mm TB but it obviously (and audibly) moves more air and allows more power; the SS guys have 95mm and 102mm options which is only like a 7.3% difference compared to an 11% difference with the 80mm for us. I guess it's more about being modified from stock vs being completely maxed out.

3.45 has always been my go-to gear choice for our cars. Some guys (Magnum for example) go with the 3.91 1LE gears but I feel like you really need a higher stall converter and a perfect transmission tune to take full advantage. 3.45 is a much slighter change but you can still trap in 3rd if you're N/A (and have a slightly higher rev limiter). Though with boost, you'll be in 4th when you trap anyway, at which point 3.91s would probably be a better choice as you'd be nearing the top of 4th.

Magnum can probably comment more on the high rpm capability of the engine with the MACE cams... If memory serves he runs a pretty wicked max rpm.