is tunnig after mods necessary?

Dan Z Man · 11-11-2010, 10:05 PM

so, i've been lookin around the internet in general for a while now, and i've come across a lot of things regarding valves when it comes to running a free flowing exhaust, or say someone is running open header or down-pipe or something..a lot of people say stuff like "have fun destroying your valves" or "wow lets just destroy the motor while you're at it"

so my question is, for those that either get headers, or test pipes, or HFC's or something regarding a free flowing exhaust, and without a tune, or even with a tune..does it really hurt the engine that bad?? like idk, it doesn't make sense to me, a ton of people do exhaust on their cars and what not and not really a lot of them have a problem "killing the valves" or whatever..can anyone shed any light on this??

also, say i do intake, exhaust and get no tune, you say it could run either rich or lean.. my question is, can it run too lean/rich and damage the car??

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11-11-2010, 10:05 PM	#4 (permalink)
Dan Z Man Enthusiast Member Join Date: Dec 2009 Location: North Carolina Posts: 286 Drives: 2010 PG 370z Rep Power: 17	so, i've been lookin around the internet in general for a while now, and i've come across a lot of things regarding valves when it comes to running a free flowing exhaust, or say someone is running open header or down-pipe or something..a lot of people say stuff like "have fun destroying your valves" or "wow lets just destroy the motor while you're at it" so my question is, for those that either get headers, or test pipes, or HFC's or something regarding a free flowing exhaust, and without a tune, or even with a tune..does it really hurt the engine that bad?? like idk, it doesn't make sense to me, a ton of people do exhaust on their cars and what not and not really a lot of them have a problem "killing the valves" or whatever..can anyone shed any light on this?? also, say i do intake, exhaust and get no tune, you say it could run either rich or lean.. my question is, can it run too lean/rich and damage the car??