Quote:
Originally Posted by faya
thanks! what if TP and CBE only?
|
Replacing the OEM cats with anything is the big one, making a tune either highly advisable or necessary -- the OEM cats are both the biggest bottleneck in the exhaust system (dramatic change in flow, head temps, etc) as well as monitored constantly by the ECU.
For a CBE, it's not really necessary, nor is it for panel filters and smooth tubes, although you will get better results for both if you do.
If you swap out the factory airboxes entirely (i.e., replace them with after market intakes) its a good idea to get a tune to ensure airflow is being metered properly.