I do. I went with one for my Stroker due to the true merged collector. It has held up fine so far.. I cant really comment on power gain as I did it with the Stroker, 24lb injectors/62mm tb etc. Combined with a high flow spun cat, super 44, and 3" all the way back it sounds great and I have no lack of power. Welds are amazing on it... good quality all the way around. I bought one based on reviews from wrangler guys... doesn't seem to have made it into the XJ area yet. They love them.

I have also had a borla and a Gibson. Both are nice... feel like I got more from the borla. Worth mentioning that the Ebay XJ headers are an EXACT copy of the Gibson... buddy bought one and while materials might be different, they are the same in every way.

The Brown dog mounts are great! I went with the full poly kit(bracket/mount) and he makes a great product. I feel the Stroker vibrating a bit but I like it. (and live in a cold state) Rubber are supposed to be better for that if it would bug you.

A flex pipe is not a bad idea either...

 

I have the rubber Brown Dog mounts under my stroker and a rubber OEM-style transmission mount. It still vibrates.

But anybody who whines about vibrations from a stroker motor really ought not be putting one in his Jeep in the first place.

 

Ding ding! True, you modified the engine outside of stock parameters. So don't expect one to be as smooth, quiet or perform as a stock motor would. You have increased the torque output which puts more strain on the stock mounts even at idle. Because the cylinders are also aligned, naturally they don't counter-balance out as smoothly as a V block engine would.

 

I wasn't complaining in the slightest... I said I like it. Just letting the dude know the poly mounts vibe a bit lol.

 

Nah, sorry, I wasn't talking about you, even though I responded to your post. It's just that I have seen a few posts in the past where people seemed to think they would get the hard rubber Brown Dog mounts instead of the poly mounts and cruise in quiet comfort. Brown Dog even says on their website that the rubber mounts are hard rubber that is much stiffer than stock.

I think mine have quieted down a bit. The first time I drove it with the 4.6L and the new mounts, it was almost obnoxious. Now, 500 miles later, you still feel that engine rumble, but it doesn't seem to be shaking the truck apart. I suppose they take a little time to break in, like everything else.

 

Same here Ian. Wasn't twords you. Its just there are those who modify their vehicles and complain that "It was smoother stock" or "I didn't have xxxx problem when it was stock" If you want stock quality, ride or performance, keep it stock people.

 

Amen.

 

I thought the poly caused more vibration than the rubber?

 

If you want to be technical about it, the engine is what causes the vibrations in the first place (and a stroked one will cause more than a stock one), the rubber just dampens the vibes a little tiny bit more than the poly does.

I think his point was that he's seen or heard of people buy the rubber ones thinking that, because they're softer than the poly, they aren't going to have any vibes at all - that it'll ride like (or smoother than) stock, even though they're running a more rumbly engine.

That's not how it works. With the rubber, they'll just have slightly less than they would have had with the poly bushings. But, if you're going to stroke your engine, you have to be prepared for it to act like a stroked out engine, and even brand new, super special, awesome, Brown Dog rubber bushing mounts aren't going to make it act like it's stock.

 

Actually I wasn't trying to be technical about it, just had always heard you feel more vibration out of a poly than a rubber mount.

 

why would a stroker vibrate more than a stock engine? unless you used a cam producing a rough idle or the engine is improperly balanced there will be no difference.

 

It takes a lot more to balance an inline block than a V block. Also you've essentially enlarged the cylinder, added more stroke and bumped the compression a little. All this leads to a larger combustion area (bigger "bang") leading to more force being transmitted to the crank.
Not to get too technical, its just a variety of factors that add up to a little extra work from the engine than stock. Not saying it will rattle your teeth out, just that you can "feel" a difference in a larger bore engine.

 

I have a stroker in mine built by Golen. There is most definitely a difference.

 

do you have any idea what you're talking about? for starters "compression increase" and "bigger combustion area" are polar opposites. bore size has 0 to do with making an engine run rough.

 

I dont know the specifics of it but my Stroker definitely shakes a bit more than the stock 4.0 that was in it, my stock XJ, and every other XJ Ive had.