am i safe to run my car with the EGR, AIR delete, and cats delete, with my longtubes? i have a 97 ss. does it matter if i have it flashed before or after? does it effect performance or just the SES lights??


thanks

 

My guess would be that it will run but not optimal. You will get that dreaded SES light. My experience with my header install, ( i have a 97 obd II as well), is i simulated my rear o2 sensors and the fronts must remain to run properly (timing). I noticed a significant difference with the one of the front o2 sensors being faulty - replaced both fronts and ran alot better. You have probably read in past post from folks that the LT4 KM made a dramatic change to no difference at all. I have a 97 as you do with the LM, (replaced resonator with bullet), headers and off road pipe and noticed a dramatic difference. I wish i had a tool for before and after to see the actual timing being retarded from false knock. Point being, it might be worth your wild to dish out an extra $40 for the LT4 KM If you havnt done so already

 

My guess would be that it will run but not optimal. You will get that dreaded SES light. My experience with my header install, ( i have a 97 obd II as well), is i simulated my rear o2 sensors and the fronts must remain to run properly (timing). I noticed a significant difference with the one of the front o2 sensors being faulty - replaced both fronts and ran alot better. You have probably read in past post from folks that the LT4 KM made a dramatic change to no difference at all. I have a 97 as you do with the LM, (replaced resonator with bullet), headers and off road pipe and noticed a dramatic difference. I wish i had a tool for before and after to see the actual timing being retarded from false knock. Point being, it might be worth your wild to dish out an extra $40 for the LT4 KM If ytou havnt done so already