2015 Mustang

[Biker Dude]

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With IRS it is quite a bit easier to control wheel hop. So in other words power generated is going to make you move forward, not hoping the wheel. Also unspung weight is lower with IRS than a live axle. Unsprung weight is a large demon in handling. The back end will have less of a tendency to kick out, specially when exiting a corner under throttle.

Thanks. What about what I asked about a more "luxurious" ride? Will it feel much smoother or is that a shock absorber / spring type of issue?

Well, yes. Primarily what affects one rear wheel will not cause the other wheel to move. Radical bumps can still be transmitted to the other side but you won't care. You will be busy planning to go get your wheels re-aligned.

But there is still spring and shock involved. You still need to spring the weight, and a shock to dampen the movement of said weight. It's just that IRS will use a coil-over-shock set up. A solid axle could use this, but you will also see them use leaf springs also.

[Twitchin Kitten]

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Well, I have to go out today and since it's already 50º I'm going to uncover the car and use it. Doubt they have leaf springs in the Mustang though. Out of curiosity I'm still going to look if I can get under there to see.

[Biker Dude]

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No, the mustang hasn't used leafs in a while. I can find out just how long if you want...

[Twitchin Kitten]

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Nah, not important. I just wanted to see if it was worth trading up. I'm still partial to my year's body style and for a base model, it's not as lame as I thought it was going to be to drive. I just want a manual transmission and a few more luxuries in regard to the sound system hooking up with my phone / bluetooth and what not instead of having to use the non-stock radio I bought. Plus looking to see if they added more 'hidey holes' for all the crap you stash in the car

8 cylinder would be nice. There really is no great difference in mileage between the 6 and the 8.

[AnthonyG]

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On those window stickers between a 6 and an 8 it's similar but I would suggest finding people on Mustang forums that have both engines and see what the real world results are between the engines.