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Could it be one of the below? There aren't many codes that stipulate Catalyst in them. P0420 Catalyst System Efficiency below Limit - Bank No 1. P0421 Catalyst System Efficiency below Limit - Bank No 1. P0430 Catalyst System Efficiency below Limit - Bank No 2. P0431 Catalyst System...

I agree with what everybody said... I also had Longtubes on my 04' GT when I had it... But I will say this... the only knock on LT's for our cars is that the cost of them + install isn't worth the power.. and it's really not, but people (myself included) do it anyway... I did mine more for sound...

Welcome Diana... and yes I think she likes my DSG better than yours! :P

Re: Hooter's meet 9-26-09 TONIGHT with NJstangers nice...

Re: Hooter's meet 9-26-09 TONIGHT with NJstangers Glad to hear you got home safely... Good time... see ya next time...

I agree to do it all at once. The power part isn't true. First off, a midpipe/catback only yields you 5-6rwhp anyhow, so... I wouldn't be to worried about if im leaving 1-2rwhp on the table, for that just make sure you like the sound... The chambered mufflers actually give you a bit more low...

Was that before or after you put cams in? I have had 2 geared Mustangs... and not really 1 of them have really messed with my gas milage... 3.90 and 4.30 sets. When i drove a lot I would get 20-22 mixed highway/city driving. May also want to check your driving habits :rock:

yeah with all that extra tach that you have on the car over the 2v... gotta go with 4.30's... You will not be sorry.. and for anyone that says you lose gas milage... driving the mach 1 from florida to ny I got around 25mpg cruising..

nice.. the Terminators really scream with the intake box gone... I had a Steeda intake... was great. BTW you do not need a tune for the intake... just check your A/F to make sure it's not skewed... but it shouldn't really throw it off that much with just the intake.

The n/a cobras have a lot of tach in em... If you're staying N/A I say forget everything but 4.30's... I have 4.30 in my Mach 1... and I would've been upset if i did any other gear. If you plan on FI - no higher then 3.90s... If anyone doubts me and you've never been in the DOHC cars with...

watch out for this guy.. he's a little bit... ya know... :) Mike just had to follow me up to New York... ha...

Bank of America like, Citi, Chase, etc. are never going to be the best interest rate loans. Since I work for the Bank; if we offered you a 16% rate I can tell you there's a reason. Especially, since I know what my credit and LTV was and I had a 4 year old car and received a 7.9% before my...

http://www.amazon.com/Titan-23175-Electronic-Digital-Caliper/dp/B000B8XYV8

Who put it in? Stock clutch? Could be in for a free replacement.

Always remember the rule of thumb... Hpipe = chambered .... xpipe = non chambered :)

niiice... Those are always fun... the only downside is going over speed bumps at -2mph on a severe angle... lol

yeah Brenspeed is one of the better places to get a canned tune.. They do quality work...

MAF Pegging wouldn't cause a 'lean' code. If his MAF is pegged with his mods.. he has more then the mods he listed. When my MAF pegged in my Cobra.. the car didn't throw codes... just seized when I slammed it in upper gears because the MAF couldn't handle it. I also had a 2004 GT with full...

Actually.. those mods should not warrant a tune. But if you're throwing those lean codes you're one of the lucky ones :)... I have heard nothing but bad things about American Muscle tunes - the GT I drove with one of their tunes felt like it was going to take a shit and die; just weird...

I don't like the prochamber and im a big mac fan.. I have the Mac o/r hpipe w/mac catback on my mach 1 and it sounds great (ask Monx).. not to loud, and very clean with a nice growl.. the prochamber has bit more growl to it, but is a more reserved sound imo... On my 04' GT I had: Mac LTs, Mac...