Ok so let me first say sorry if this question has been answered time and time again. But I've noticed reading some of the threads a lot of people experience this hesitation that really had me worried. I am running aam test pipes, y pipe, and single exhaust and I've noticed whenever I nail it I get a lot of hesitation anywhere below 3k unless in first gear. What's the deal? What causes this? And would a tune help rid the problem or do I need to put my cats back on?? Thanks guys.

 

sounds like it could be running lean...get it on a dyno with a wideband and datalogger, and go from there

 

+1 to Z1's comment, probably running lean hence the hesitation

 

i had this problem when i had only my tp's and the nismo exhaust minus the y pipe
once i got my nismo y pipe the hesitation went away

 

The mods altered the horsepower and torque curves. How I don't know.

 

+1 to running lean, do you have a cel yet?? This happened to a majority of the members when just installing test pipes with stock exhaust. Happend to me also but once i got a true dual went away completely, would defiantly get rid of most of it with a tune or buy a true dual

 

exact same problem in the exact same rpm range.

fast intentions hfc's, turbo xs y-pipe and exhaust.

thinking of just getting fast intentions intimidator true dual to get rid of the problem.

 

When I had stock catback with TP's I had the hesitation. When I put on my cutom catback it went away.

 

Horribly annoying.

 

What size single exhaust do you have?

 

I am running a 3in single. And yes the test pipes caused the cel to come on within 3 days of installing them. I have considered getting a true dual exhaust custom made. But I really like the look of the single. But I've def noticed I lost my low end power for better top end and I miss that. Guess its time for a change.

 

i have a fix posted for the cel. should try it you will notice a difference without that cel on.

 

3" is too big.