My project

[Canadian Crimson]

Idea was good but would Think would have been better if you have went to machine shop and had them make you plates for the size of the frame would have better contact between the 2 might be wrong but Think would have put less stress where the washers are

There used to be a company in the US that made billet aluminum ones but I can’t find them anymore. What I will probably end up doing is denting the pipe a little like you do for header clearance.

 

[Canadian Crimson]

I would clean up those rusted areas under plate, and give a quick piant, so it looks better and stops furture rust.
hard to tell in pics, but looks like a lot of salt residue on bottom of car.

There is a little rust on the chipped paint on the chassis braces, but as far as I know it has never seen salt . Still only has 37k on it and it’s 7 years old.

 

[Canadian Crimson]

So today took it for a little rip. And in typical aftermarket header fashion , the check engine light is on with the cat efficiency code. Time to order defoulers for the O2 sensors I guess.

 

[white 5.0]

You will be just fine installing them and driving them around for a little bit, but you will have a check engine light and your car will most likely be running a little lean and honestly make almost the same power as stock until you get a proper dyno tune

 

[67 AGAIN]

You will be just fine installing them and driving them around for a little bit, but you will have a check engine light and your car will most likely be running a little lean and honestly make almost the same power as stock until you get a proper dyno tune

What he said.
And lean is not good if you like to visit Mexico once in a while.

 

[AC Bill]

Sorry, but I'm not familiar enough with the set up. What does that plate actually do? Is it a shield, or does it act as a support?
How is it the new long tube headers would not effect the tune? Will the sensors alone adjust the ECM enough to gain the added performance the system will offer?
Sounds great!

 

[Canadian Crimson]

Sorry, but I'm not familiar enough with the set up. What does that plate actually do? Is it a shield, or does it act as a support?
How is it the new long tube headers would not effect the tune? Will the sensors alone adjust the ECM enough to gain the added performance the system will offer?
Sounds great!

The plate is just the rear mount for the chassis braces that are on convertibles.

 

[Canadian Crimson]

As far as tuning goes, I did email a reputable US tuner and they said for just headers and exhaust it does not require a tune. The computer will adjust on its own. Unless you change the intake and put a CAI on. Then it needs to be tuned for the different diameter piping on the intake.

 

[67 AGAIN]

That plate reinforces the chassis because his car is a convertible.
The coupe cars don’t have that plate.

 

[Ohtobbad]

As far as tuning goes, I did email a reputable US tuner and they said for just headers and exhaust it does not require a tune. The computer will adjust on its own. Unless you change the intake and put a CAI on. Then it needs to be tuned for the different diameter piping on the intake.

I would do the CAI, one of the cheapest things you can to imrpove HP and
response on these cars. JLT setups are one of best IMO

 

[67 AGAIN]

Is there a reason to do long tubes without matching intake flow, knowing it will yield limited gains?
Or was it done solely for louder exhaust note?

 

[67 AGAIN]

I would do the CAI, one of the cheapest things you can to imrpove HP and
response on these cars. JLT setups are one of best IMO

Plus one on everything Trevor said here.

 

[Ohtobbad]

Plus one on everything Trevor said here.

+1 to you Marc, But as you said, looking for loud, that will do it,
likely giving up 3/4 of HP gains without CAI and tune.

 

[67 AGAIN]

+1 to you Marc, But as you said, looking for loud, that will do it,
likely giving up 3/4 of HP gains without CAI and tune.

There won’t be much, if any.
I’m surprised a tuner gave advice that no tune is required, regardless of CAI or not.
Long tubes are a big change to the whole system.
Not just in terms of increased flow but now there is less back pressure than before , which has an impact on torque production.

White 5.0 said it first, and it pains me to repeat that without a tune, likely not much better than it was stock.

 

[Canadian Crimson]

The reason I didn’t put a CAI on is because I will most likely be going boosted in the future, but once vet once I guess. The long tubes fell into my lap on a good deal last fall, so they came first, and if you are going to tear the exhaust apart to do the headers, might as well do a cat back at the same time lol.