jeepster666

I know I know, long tubes are better, but hear me out.

I have a limited budget and need to do a lot to my car. Several issues have come up and I finally have a little $$$ to get some of them fixed.

My clutch is starting to slip, but that's covered more in another thread. I am also throwing a code for Cat efficiency failure. Recent dyno showed 414 whp vs the 489 whp it did 2 years ago! Plugs look fine, assuming I have a plugged cat at this point!

2005 V, 77k with maggie and corsa. Maggie was dealer installed (0 miles). Im changing mm, trans, diff bushings since mine are all shot. Im also doing brakes as they are in need. I need to do cats and want to do headers, but dont have the cash for headers/cats and a clutch so..........

I can do LS7/F1 clutch ($550) and these hi-flow magnaflow cats ($310) or pacesetter or obx Headers with cats and limp the clutch another month or two.

What are your opinions? I only have about $850 to spend total. Not sure what my future budget will allow as I have a new business!

Are the cats gonna be an improvement over stock? Its currently my wifes daily driver, so street manners are important. End goal with the car is to get it back to tip top shape, professional tune and hope to hit about 500 whp with perfect street manners. (oh, and get my wife back to driving the tahoe when my truck is running again!)

Onefast V

iTrader: (3)

Were the dynos different? Time of year/weather... Many things can effect your Dyno readings

jeepster666

It was a different time of year. It was the same dyno, although they moved their shop in between the readings so......
The main concern wasn't really the peak number, but the fact that the torque and HP dropped off big time after about 4500rpm on the latest dyno. Two other V's (one NA with nitrous and the other maggied) dynoed with me and they both had the curve I was used to....nice and flat.

Im blaming some of the problem on the magnacharger electronics box. That thing is a pile of sh*t. It has left me stranded twice due to failure and I have had repeated issues with the electrical plug shorting out! Thats why I want a custom tune and eliminate that thing. Is that possible?

Has anyone used the obx catted headers and passed emissions?

98cobra

iTrader: (32)

Or just buy my obx headers and kooks cats

jeepster666

email me some pics leviwaitdc@gmail.com

will these fit right to a corsa exhaust?

DMM

^ This. A CAT efficiency DTC doesn't mean the CAT's are clogged by any means, BTW. And you WILL have the same DTC for aftermarket CAT's also. I believe the general consensus is the OE CAT's cost about 15 whp and the headers are good for 10 whp on top of that.

The dyno readings don't really mean much of anything, unless they were back to back.

If you're talking about the Magnavolt, they have left many stranded. You can either upgrade to a Kenne Bell BAP or either a Racetronix in tank pump or a DW 300 (which is what I did). I would recommend replacing the in tank pump over another BAP.

Skidmarcx

I'd check into your loss of power more thoroughly... If you're running lean it could end up bad for you... Ditch the Magnavolt and get a larger in tank pump for a couple hundred bucks... Gut your stock cats and have your tune adjusted to eliminate the codes associated with that... And get your clutch

Onefast V

iTrader: (3)

All the magnavolt does is boost the voltage to the fuel pump to basically overdrive it when it need more fuel. If you put a bigger fuel pump in you do not need a retune and it should no longer be using the magnavolt. But yes you could also run a tune without the magnavolt hooked up.

Also look at the condition of your drive belt and make sure it is not slipping at those higher RPMs

jeepster666

I just finished reading on exactly what the magnavolt does (was misinformed about that). Now I REALLY hate it!

I thought about belt slippage but didn't show signs of it like the last belt change did. (sound, noticeable power changes when its cold, etc).

Just to clarify. I can replace my stock pump with an in tank walbro 255L, uninstall the Magnavolt and do nothing else??

If Im getting the cat code all of a sudden, and its not the cats, what else could it be? I cleared the codes once and they came back almost immediately!

Skidmarcx

Yes the 255 is a direct replacement... And your tuner can disable the o2 sensor related codes, so your CEL won't activate from the low efficiency catalyst situation

Onefast V

iTrader: (3)

Yes you can install the ractronix hotwire kit and walboro 255 and do nothing else.

54inches

iTrader: (4)

LS7 clutch is going to cost more than 550 with everything that you need. Closer to 850.

IF you can wait, I would get your cat issue fixed first.

I would replace both cats and take it back to have it tuned and turn the rear 02s off.

Brackets

Is the DW300 a direct replacement as well?

DACTARI

iTrader: (1)

If you're gonna have the rear o2s turned off, just gut the cats. Cheap flow.

jeepster666

everything I need minus new bolts for $550 shipped

jeepster666

I still have to pass emissions though, so no cats is a no go for me.