When I come to a stop sign, or stop light, if my windows are down i can smell exhaust gas, like rich exhaust gas... im just wondering if this is because its tuned, and has an after market exhaust?

-2004 WRB WRX wagon
-JDM STi Version 8 EJ207 AVCS motor swap w/matching ECU
-VF37 twin scroll turbo
-K&N Typhoon short ram intake
-3" Cat-less Downpipe
-3" Invidia Q300 cat-back exhaust
-GrimmSpeed 3 port EBCS
-JDM STi Version 8 6-speed transmission swap w/DCCDPro controller
-Autometer wideband AFR and boost gauges
-STi hood scoop w/JDM Ver. 8 splitter
-HID 8000k headlights
-Eibach Pro-kit lowering springs
-1/2" saggy butt spacers (looks great)
-Black TSW "Track Star" 17" wheels
-Cross drilled and Slotted brakes F&R
-All windows tinted
-Roof rack w/cross bars
-tuned by EQ Tuning for 91 octane
-270whp and 260ft-lbs of torque at 18 psi on a DynoCom dyno @ .80 correction.

 

Nice set up bro!! Have you checked the donut gaskets between the drop down and the exhaust and all the other gaskets in the piping? I had the same issue once on my 06 and t was a bad gasket seal. Every case is different though.

 

It's because you are running a catless downpipe, it will usually smell a little. Question is whether its stinkier than usual.

/wink

 

Running a catless exhaust system can really result in smell? I'm having the same problem just haven't found the exhaust leak...

 

It's the catless exhaust. There is nothing there to tone down the exhaust fumes. Only reason you notice it stopped at a light is because you're stopped and not moving away from it.

The catalytic converters are like underwear: fart wearing underwear and it smells a little, but fart naked and your dog hates you.

 

Check your midpipe and axelback connections...


issue happened to me, and my midpipe screws started backing up

 

its most likely the catless like people said. The way I text to see if I have an exhaust leak is stomp on it where there are high walls on both sides of you and listen closely for something that sounds like air escaping. if its just the same smell when you go in reverse with your windows down, its probably just that you are catless

 

Im going to go with the catless theory, its kinda what i figured in the first place. I had a 2005 dodge cummins diesel pick up once, I straight piped it and as soon as that cat was gone it was the same thing, when i stopped i could smell exhaust. Thanks for all input guys.