I wouldnt need a tune if i did just this on my 114 would I. I am planning on getting a full system later this year, but this would be a cheap way to live with what I have until then. I don't want to screw my motor up though.

 

That is correct, if you pull the baffles and put the Thunder Torque Inserts™ in you do NOT need to tune/reflash. The M8's do not have the lean problem the Twin Cams do. Of course, any M8 will run stronger/better with a good tune, even if it is bone stock, but no damage to the engine if you don't.

Here is a LINK to a report on the M8 engines, part of which shows the AFR and the ability of the ECM to adjust to varying conditions.

 

So, does the ECM on the M8 use data from the O2 sensors to adjust the air to fuel mix? And if so, won't I get an error message if I add a high flow intake and remove the caffles(first time I've seen the catalytic converters in the baffles, so I gave them a name. You can have that one at no charge.)?

 

Yes, the ECM adjust based on the o2 sensors, real time, plus it make trim adjustments that are active while in open loop. No, you will not get an error message, this is what the ECM does as a matter of course.

Will it run better if you use a tuner? Yes, but it is not necessary to avoid problems, like on the Twin Cams.

This report has data and charts showing the M8 is completely different than the Twin Cams in regards to the AFR NOT being too lean from the factory like the TC's. LINK to report.

Copy and paste of just one of the charts from report link above-