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      10-28-2009, 09:56 PM   #48
Singletrack
4th down; 4th quarter? Renegade.
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Drives: 09 SSII E92 M3; 12 AW X5d
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Quote:
Originally Posted by Rom3n View Post
Correct

If you are running a full catless exhaust system you should benefit from a proper custom tune.
Would you say that if you are running a full catless, you should have a custom tune to be safe? In other words, will the stock engine management keep things "safe" from an AFR standpoint with a full catless setup? What about other setups that have high flow cats?

I noticed that most of the downpipe-back exhaust manufacturers don't post AFR graphs, which is why I ask. There's also a lot of unsubstantiated claims about hiccups at certain RPMs with certain setups, loss of low end torque, etc.

Glad you decided to chime in!