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Message: <blockquote data-quote="shovel" data-source="post: 1540934" data-attributes="member: 29855">The EGR,  evap and secondary air are three unrelated systems.Secondary air feeds oxygen to the catalytic converters so they can do their job (they need oxygen to make new molecules,  exhaust doesn't have much oxygen in it) .  On a stock vehicle it also feeds oxygen into the heads to deliver oxygen to the upstream cats,  and possibly to serve as a feedback mechanism to announce it is working (because there are no downstream o2 sensors on a 94/95 v8) EGR maintains dynamic compression ratio at part throttle and limits peak cylinder temperature which reduces NOx emissions and also provides more consistent throttle response at part throttle and extends the life of your exhaust valve stem sealsEvap keeps your garage from smelling like an old lawn mower and lets you burn all the fuel you paid for.What you do with those things is your business I'm not the smog police but it's a good idea to know what the stuff does because it's more than just to please the authorities.All of those plastic hoses can be replaced with rubber especially if you have deleted some parts,  I personally wouldn't choose to delete the evap or EGR even if I literally hated birds and trees.      If you are definitely not going to have EGR and secondary air you can remove the 3 solenoids under the passenger side fender.    If you later decide you want EGR after all you can put the solenoid anywhere (like against the firewall).  If you delete the evap solenoid you might still want to have a hose with an orifice going to the evap canister just to stop your car from smelling gross.   You can make an orifice the right size by epoxying a short length of "WD-40 can" straw into a vacuum butt connector - that's little enough air it won't affect your idle but enough flow to burn off those fuel vapors you paid good money for at the pump.</blockquote>