after putting on my slp catback superflow im getting bad gas mileage . any thoughts?

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04 gt. halos, window tint, brushed aluminum interior trim, red leds. custom mats, debadged, 18" TSW wheels, black with mirror lip. CAI,slp cat back.

Usually freeing up your exhaust will net better fuel economy. Also the affects of a catback on our cars are so mininal that they really wouldnt have any affect on the engine. Have your driving habits changed since you installed your catback?? Alot of people drive more aggressive after a catback thus resulting in poor fuel economy.

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well ya maybee my driving habits changed a little ill see how it goes the next few days on full tank. do you gain any more horsepower from them? it feels like i did but it could be just me

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04 gt. halos, window tint, brushed aluminum interior trim, red leds. custom mats, debadged, 18" TSW wheels, black with mirror lip. CAI,slp cat back.

u dont really gain hp from exhaust you just make ur engine work less now then it did b4 the exhaust if your driving habbits are the same. its like breathing through your pillow to breathing normally, just makes everything easier but exhaust work will allow you to run more HP easier and should help with engine temps

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05 GP GXP / Cartuning Turbo Kit / Cutout / Ported LS4 intake Manifold / HP Tuned / Custom 3" exhaust / Highflow Cat / SSC Springs / Poly Dogbone Mount's / 2nd Tranny / 12.6@109mph 1.7 60ft

Sounds like you got the heavy right foot mod when you installed the exhaust.

How do you like that exhaust out of curiosity?

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

My mileage went down about 2 mpg when I installed my ZZP 3" Catback, 3" DP, and Plog.....

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i love it sounds great

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04 gt. halos, window tint, brushed aluminum interior trim, red leds. custom mats, debadged, 18" TSW wheels, black with mirror lip. CAI,slp cat back.

does the lower MPG also corolate to how much you like the sound fo the car at higher RPM and do you stay att he higher RPM more often

if so nothing wrong just back off a bit

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Not sure where you live but, it's that time of year up here where we get the winter gas treatment.. poor gas mileage until April now, woot! Just throwing it out there, otherwise it's probably a heavier foot like others have stated!

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T66 Turbo,3" downpipes, oversized A2A,Stg3 heads/cam,hv3,built trans,bilstein struts,ssc springs,gxp brakes,pace car spoiler(1of3??),lots more.. dyno'd @ 421WHP~13lbs boost on OLD setup. New = ???

^^Good point. Winterblend sucks!!!

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

oh yeah compleatly slipped my mind

the GTP went from 22-23 down to 19-20

still better thent he GTX was managing in the summer with good gas

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

when i put on headers as my only mod, my MPG was better on the highway but around town it dropped 1-2MPG. I put on a CAI as the second mod and it helped improve the gas mileage overall.