Terrible Gas mileage?

[phi1542]

Well, since you have the J30A1, you can get a Magnaflow Highflow CAT .

Yeah! Some DC Sport headers would be nice too There's a ton of stuff I have to replace as well but I cant until I get money. Does a bad cat mess up mpg? I was thinking about just holding it off until I need a SMOG hahaha

 

[CDsDontBurn]

I had dismal mpg when I bought my car.

Tuneups didnt do much. It didn't start to come into its own until I cleaned the plenum, iacv, egr. Replacing the bad cat and factory exhaust helped too.

Yeah! Some DC Sport headers would be nice too There's a ton of stuff I have to replace as well but I cant until I get money. Does a bad cat mess up mpg? I was thinking about just holding it off until I need a SMOG hahaha

Bad CAT will reduce your MPGs as previously stated.

Also, the CAT I linked is *supposed* to be California smog legal. I won't be able to find this out until next year though, lol.

Headers aren't a requirement to replace unless they're cracked. Otherwise, you're just spending money you don't need to spend. IMO, if you're thinking of getting upgrades but don't have the cash to get upgrades whenever you want, get them whenever the part that's being replaced due to failure is happening. For example you want a high flow CAT but don't have the money. Get it now that your OEM CAT is bad.

 

[phi1542]

Bad CAT will reduce your MPGs as previously stated.

Also, the CAT I linked is *supposed* to be California smog legal. I won't be able to find this out until next year though, lol.

Headers aren't a requirement to replace unless they're cracked. Otherwise, you're just spending money you don't need to spend. IMO, if you're thinking of getting upgrades but don't have the cash to get upgrades whenever you want, get them whenever the part that's being replaced due to failure is happening. For example you want a high flow CAT but don't have the money. Get it now that your OEM CAT is bad.

That is a very good point lol Thanks for all the help! Much appreciated

 

[Brad2274]

Would an EGR block off plate help with mpgs? I heard that theyre meant to recirculate exhaust into intake for emmissions and that removing it can help MPG and HP

 

[CDsDontBurn]

Would an EGR block off plate help with mpgs? I heard that theyre meant to recirculate exhaust into intake for emmissions and that removing it can help MPG and HP

I've heard the exact opposite.

 

[Lebowski]

Unless you can have the car tuned to compensate running no egr it will be horrible. Flat spots in the revs, a cel of course. Its Not like the old days when american automakers took great running cars and slapped emission controls on them as an afterthought.

I'm not too familiar with the v6's but on my i4 cleaning the pintle on the egr and the egr passage helped wonders. There was so much carbon on the egr valve that im surprised it worked.