jdbaugh1

iTrader: (1)

As I'm supercharged do you think switching from the stock manifold to ZZPs long tube header with 1.75" primaries would require a re-calibration to get the full benifit (I have to rely on Trifecta)?

LsCobalt07

iTrader: (2)

I believe you will be fine without a retune, there is a chance that you set an O2 sensor code. If you do retune you will be able to maximize your gains from the header.

chevygirl2006

It's not really needed

jdbaugh1

iTrader: (1)

I already have it installed and I am not throwing any O2 codes. I just put it on and I thought it would be a noticeable improvement over the stock as it is very restrictive in comparison. All I seem to notice is a drop in low end torque, but maybe it's my imagination.

jcobaltss

No you need a tune to see any gains in performance

ECaulk

iTrader: (6)

No you don't, if the header flows better than stock there will be gains up top even without tuning. The ecu used on the l61 it not a torque based ecu that limits power to a certain level. To get the most gain safely you need a tune.

OP if you have a wideband make sure your afrs are in check for WOT and that will tell you if you need a retune