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I used the spray in my intake and now my turbo seals are blown, my battery blew up. My headlights converted from LED to halogens also my exhaust fell off. Please dont use these products.

Can you report your 87 tune mileage?

Nothing you dump in the tank is going to touch intake valves on a D.I. engine

you have answered a question I've had for a while now. thanks.

Same. I value my life and safety more than my truck. If I feel safer and more confident in 4wd I'm putting in in 4wd. I don't see why so many people are pushing against 4wd. Its your truck do what you want with it. In Michigan, 4wd is a must, even if all these so called experts say you "don't...

The highflow cat down pipe will do that.

This 100% works. Wtf why isnt this done from factory!!! My truck feels 100% different.

It doesn't matter. I did extensive research. Unless the muffler was specifically engineered to go one way and that's the only way it makes power due to some thermodynamic pressure crap, it doesn't matter. Also Gibson doesn't know what they are talking about because you cant mount the 2.5 inch...

I dont understand why people dont use LED's and re-aim their headlights.

Got mine installed tonight. Rachet method is the best. With a gibson exhaust I had plenty of room. Hardest part was messing with rachet straps...

For sure power gains! Without a doubt.

I bought a pipe expander to make the flanges slightly bigger and the pipe slid right in. Is there a performance issue having the exhaust backwards?

I had the reverse issue too, thats why its discounted. Its a major pain in the ass.

@Litehauler How tight was your 2.5 inch u-bolt clamp at the pipe coming from engine to muffler? I tightened the clamp all the way and it still feels like I can wiggle the exhaust, is that ok? would you mind showing pics of yours?

Could you elaborate a little more about " the pipe section that goes into muffler has be fully aligned or it won’t connect." Does my picture above look ok?

I dont think I can recommend wunder car parts to anyone. Spent 4 hours tonight trying to install this thing. Its definitely labeled wrong. I cannot get the over axel pipe into the rear of the muffler because the flanges are too tight. Also the mid pipe from engine to the "inlet" ( even tho inlet...

Any difference between the bilstien and the eibach ?

Will these be an improvement over non fx4 package?

Im not sure I agree with that internet search. Our stock ECU tunes for 93 and 87... It will automatically detune the engine for 87, it must have automatic knock sensors... So with a tune, id expect the same system to work.

What happens if you have a 91/93 tune and you put in 87? Does the tune just become less effective? Or does it cause damage to engine?